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Add a new legacyEntryPoints codemod transformation step.
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Lines changed: 322 additions & 12 deletions

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‎.changeset/brave-pandas-battle.md‎

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---
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"@apollo/client-codemod-migrate-3-to-4": patch
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---
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Add a new `legacyEntryPoints` transformation step that moves imports from old legacy entry points like `@apollo/client/main.cjs` or `@apollo/client/react/react.cjs` to the new entry points like `@apollo/client` or `@apollo/client/react`.

‎scripts/codemods/ac3-to-ac4/README.md‎

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@@ -14,6 +14,9 @@ npx @apollo/client-codemod-migrate-3-to-4 --parser ts file1.ts file2.ts --codem
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### Available codemods:
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In the order they will be applied per default if you don't manually specify a codemod:
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- `legacyEntryPoints`: Moves imports from old legacy entry points like `@apollo/client/main.cjs` or `@apollo/client/react/react.cjs` to the new entry points like `@apollo/client` or `@apollo/client/react`.
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- `imports`: Moves imports that have been moved or renamed in Apollo Client 4. Also moves types into namespace imports where applicable.
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- `links`: Moves `split`, `from`, `concat` and `empty` onto the `ApolloLink` namespace, changes funtion link invocations like `createHttpLink(...)` to their class equivalents like (`new HttpLink(...)`).
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Does not change `setContext((operation, prevContext) => {})` to `new ContextLink((prevContext, operation) => {})` - this requires manual intervention, as the order of callback arguments is flipped and this is not reliable codemoddable.

‎scripts/codemods/ac3-to-ac4/src/__tests__/imports.test.ts‎

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import { applyTransform } from "jscodeshift/dist/testUtils";
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import { describe, expect, test } from "vitest";
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import imports from "../imports.js";
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const transform = ([source]: TemplateStringsArray) =>
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applyTransform(imports, {}, { source }, { parser: "ts" });
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describe("aliases if `legacyEntryPoints` transform was not applied", () => {
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test('moves into existing compatible "legacy" entry point', () => {
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expect(
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transform`
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import { useQuery } from "@apollo/client/index.js";
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import { somethingElse } from "@apollo/client/react/react.cjs";
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`
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).toMatchInlineSnapshot(
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`"import { somethingElse, useQuery } from "@apollo/client/react/react.cjs";"`
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);
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});
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test("if nonexistant, creates new modern entry points", () => {
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expect(
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transform`
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import { useQuery } from "@apollo/client/index.js";
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`
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).toMatchInlineSnapshot(
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`"import { useQuery } from "@apollo/client/react";"`
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);
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});
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});

‎scripts/codemods/ac3-to-ac4/src/__tests__/legacyEntryPoints.test.ts‎

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import { applyTransform } from "jscodeshift/dist/testUtils";
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import { expect, test } from "vitest";
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import legacyEntrypointTransform from "../legacyEntrypoints.js";
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const transform = ([source]: TemplateStringsArray) =>
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applyTransform(legacyEntrypointTransform, {}, { source }, { parser: "ts" });
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test("renames", () => {
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expect(
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transform`import { something } from "@apollo/client/apollo-client.cjs";`
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).toMatchInlineSnapshot(`"import { something } from "@apollo/client";"`);
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expect(
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transform`import { something } from "@apollo/client/apollo-client.min.cjs";`
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).toMatchInlineSnapshot(`"import { something } from "@apollo/client";"`);
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expect(
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transform`import { something } from "@apollo/client/index.js";`
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).toMatchInlineSnapshot(`"import { something } from "@apollo/client";"`);
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expect(
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transform`import { something } from "@apollo/client/main.cjs";`
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).toMatchInlineSnapshot(`"import { something } from "@apollo/client";"`);
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expect(
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transform`import { something } from "@apollo/client/main.cjs.native.js";`
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).toMatchInlineSnapshot(`"import { something } from "@apollo/client";"`);
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expect(
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transform`import { something } from "@apollo/client/core/index.js";`
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).toMatchInlineSnapshot(`"import { something } from "@apollo/client";"`);
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expect(
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transform`import { something } from "@apollo/client/link/core/index.js";`
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).toMatchInlineSnapshot(`"import { something } from "@apollo/client/link";"`);
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expect(
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transform`import { something } from "@apollo/client/link/core/core.cjs";`
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).toMatchInlineSnapshot(`"import { something } from "@apollo/client/link";"`);
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});
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test("merge into existing import", () => {
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expect(
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transform`
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import { something } from "@apollo/client/core/index.js";
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import { somethingElse } from "@apollo/client";
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`
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).toMatchInlineSnapshot(
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`"import { somethingElse, something } from "@apollo/client";"`
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);
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});
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test("avoids merging type/value", () => {
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expect(
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transform`
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import type { something } from "@apollo/client/core/index.js";
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import { somethingElse } from "@apollo/client";
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`
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).toMatchInlineSnapshot(
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`
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"import type { something } from "@apollo/client";
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import { somethingElse } from "@apollo/client";"
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`
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);
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expect(
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transform`
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import { something } from "@apollo/client/core/index.js";
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import type { somethingElse } from "@apollo/client";
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`
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).toMatchInlineSnapshot(
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`
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"import { something } from "@apollo/client";
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import type { somethingElse } from "@apollo/client";"
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`
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);
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});

‎scripts/codemods/ac3-to-ac4/src/index.ts‎

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import type { API, FileInfo, Options, Transform } from "jscodeshift";
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import imports from "./imports.js";
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import legacyEntrypoints from "./legacyEntrypoints.js";
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import links from "./links.js";
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import removals from "./removals.js";
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import { monkeyPatchAstTypes } from "./util/monkeyPatchAstTypes.js";
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export const codemods = { imports, links, removals } satisfies Record<
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string,
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Transform
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>;
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export const codemods = {
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legacyEntrypoints,
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imports,
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links,
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removals,
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} satisfies Record<string, Transform>;
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export default async function transform(
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file: FileInfo,

‎scripts/codemods/ac3-to-ac4/src/legacyEntrypoints.ts‎

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import type { Transform } from "jscodeshift";
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import { entryPointAliases } from "./util/entryPointAliases.js";
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import { handleModuleRename } from "./util/handleModuleRename.js";
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const legacyEntrypointTransform: Transform = function transform(file, api) {
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const j = api.jscodeshift;
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const source = j(file.source);
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const context = { j, source };
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let modified = false;
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for (const [to, legacy] of Object.entries(entryPointAliases)) {
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for (const from of legacy) {
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handleModuleRename({
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rename: { to: { module: to }, from: { module: from } },
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context,
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onModify() {
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modified = true;
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},
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});
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}
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}
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return modified ? source.toSource() : undefined;
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};
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export default legacyEntrypointTransform;

‎scripts/codemods/ac3-to-ac4/src/util/entryPointAliases.ts‎

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/*
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```sh
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jq --slurpfile packages <(find . -name package.json | xargs cat) '$packages|map({key:.name, value: [.name+"/"+.main,.name+"/"+.module]})|from_entries' <(echo '{}')
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```
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*/
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const fromPackageJson = {
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"@apollo/client/core": [
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"@apollo/client/core/core.cjs",
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"@apollo/client/core/index.js",
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],
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"@apollo/client/cache": [
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"@apollo/client/cache/cache.cjs",
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"@apollo/client/cache/index.js",
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],
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"@apollo/client/utilities/globals": [
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"@apollo/client/utilities/globals/globals.cjs",
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"@apollo/client/utilities/globals/index.js",
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],
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"@apollo/client/utilities/subscriptions/urql": [
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"@apollo/client/utilities/subscriptions/urql/urql.cjs",
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"@apollo/client/utilities/subscriptions/urql/index.js",
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],
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"@apollo/client/utilities/subscriptions/relay": [
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"@apollo/client/utilities/subscriptions/relay/relay.cjs",
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"@apollo/client/utilities/subscriptions/relay/index.js",
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],
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"@apollo/client/utilities": [
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"@apollo/client/utilities/utilities.cjs",
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"@apollo/client/utilities/index.js",
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],
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"@apollo/client/testing/experimental": [
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"@apollo/client/testing/experimental/experimental.cjs",
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"@apollo/client/testing/experimental/index.js",
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],
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"@apollo/client/testing/core": [
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"@apollo/client/testing/core/core.cjs",
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"@apollo/client/testing/core/index.js",
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],
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"@apollo/client/testing": [
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"@apollo/client/testing/testing.cjs",
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"@apollo/client/testing/index.js",
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],
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"@apollo/client/link/remove-typename": [
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"@apollo/client/link/remove-typename/remove-typename.cjs",
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"@apollo/client/link/remove-typename/index.js",
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],
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"@apollo/client/link/context": [
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"@apollo/client/link/context/context.cjs",
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"@apollo/client/link/context/index.js",
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],
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"@apollo/client/link/core": [
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"@apollo/client/link/core/core.cjs",
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"@apollo/client/link/core/index.js",
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],
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"@apollo/client/link/retry": [
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"@apollo/client/link/retry/retry.cjs",
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"@apollo/client/link/retry/index.js",
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],
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"@apollo/client/link/utils": [
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"@apollo/client/link/utils/utils.cjs",
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"@apollo/client/link/utils/index.js",
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],
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"@apollo/client/link/subscriptions": [
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"@apollo/client/link/subscriptions/subscriptions.cjs",
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"@apollo/client/link/subscriptions/index.js",
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],
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"@apollo/client/link/schema": [
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"@apollo/client/link/schema/schema.cjs",
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"@apollo/client/link/schema/index.js",
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],
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"@apollo/client/link/http": [
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"@apollo/client/link/http/http.cjs",
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"@apollo/client/link/http/index.js",
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],
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"@apollo/client/link/batch": [
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"@apollo/client/link/batch/batch.cjs",
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"@apollo/client/link/batch/index.js",
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],
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"@apollo/client/link/batch-http": [
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"@apollo/client/link/batch-http/batch-http.cjs",
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"@apollo/client/link/batch-http/index.js",
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],
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"@apollo/client/link/error": [
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"@apollo/client/link/error/error.cjs",
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"@apollo/client/link/error/index.js",
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],
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"@apollo/client/link/persisted-queries": [
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"@apollo/client/link/persisted-queries/persisted-queries.cjs",
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"@apollo/client/link/persisted-queries/index.js",
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],
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"@apollo/client/link/ws": [
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"@apollo/client/link/ws/ws.cjs",
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"@apollo/client/link/ws/index.js",
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],
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"@apollo/client": ["@apollo/client/./main.cjs", "@apollo/client/./index.js"],
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"@apollo/client/dev": [
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"@apollo/client/dev/dev.cjs",
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"@apollo/client/dev/index.js",
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],
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"@apollo/client/errors": [
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"@apollo/client/errors/errors.cjs",
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"@apollo/client/errors/index.js",
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],
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"@apollo/client/react/context": [
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"@apollo/client/react/context/context.cjs",
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"@apollo/client/react/context/index.js",
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],
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"@apollo/client/react/hoc": [
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"@apollo/client/react/hoc/hoc.cjs",
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"@apollo/client/react/hoc/index.js",
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],
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"@apollo/client/react/internal": [
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"@apollo/client/react/internal/internal.cjs",
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"@apollo/client/react/internal/index.js",
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],
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"@apollo/client/react/parser": [
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"@apollo/client/react/parser/parser.cjs",
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"@apollo/client/react/parser/index.js",
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],
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"@apollo/client/react/ssr": [
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"@apollo/client/react/ssr/ssr.cjs",
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"@apollo/client/react/ssr/index.js",
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],
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"@apollo/client/react/components": [
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"@apollo/client/react/components/components.cjs",
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"@apollo/client/react/components/index.js",
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],
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"@apollo/client/react": [
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"@apollo/client/react/react.cjs",
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"@apollo/client/react/index.js",
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],
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"@apollo/client/react/hooks": [
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"@apollo/client/react/hooks/hooks.cjs",
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"@apollo/client/react/hooks/index.js",
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],
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"@apollo/client/masking": [
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"@apollo/client/masking/masking.cjs",
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"@apollo/client/masking/index.js",
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],
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} satisfies Record<string, string[]>;
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export const entryPointAliases = {
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...fromPackageJson,
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"@apollo/client/core": [] as string[],
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"@apollo/client": [
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"@apollo/client/apollo-client.cjs",
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"@apollo/client/apollo-client.min.cjs",
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"@apollo/client/index.js",
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"@apollo/client/main.cjs",
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"@apollo/client/main.cjs.native.js",
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...fromPackageJson["@apollo/client/core"],
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],
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"@apollo/client/link/core": [] as string[],
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"@apollo/client/link": fromPackageJson["@apollo/client/link/core"],
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} satisfies Record<string, string[]>;

‎scripts/codemods/ac3-to-ac4/src/util/findImportDeclarationFor.ts‎

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@@ -4,6 +4,8 @@ import type * as j from "jscodeshift/src/core.js";
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import type { IdentifierRename } from "../renames.js";
55
import type { ImportKind, UtilContext } from "../types.js";
66

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import { entryPointAliases } from "./entryPointAliases.js";
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79
const typeImportsFirst = (
810
a: j.ASTPath<namedTypes.ImportDeclaration>,
911
b: j.ASTPath<namedTypes.ImportDeclaration>
@@ -16,13 +18,15 @@ export function findImportDeclarationFor({
1618
description,
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compatibleWith = "type",
1820
context: { j, source },
21+
exact = false,
1922
}: {
2023
description: Pick<
2124
IdentifierRename["from"] & IdentifierRename["to"],
2225
"module" | "alternativeModules"
2326
>;
2427
compatibleWith?: ImportKind;
2528
context: UtilContext;
29+
exact?: boolean;
2630
}): j.Collection<namedTypes.ImportDeclaration> {
2731
const test = (node: namedTypes.ImportDeclaration) => {
2832
const isValidImportKind =
@@ -48,12 +52,18 @@ export function findImportDeclarationFor({
4852
)
4953
.paths()
5054
.sort(typeImportsFirst);
51-
return j(perfectMatch.concat(...alternativeMatches));
52-
/**
53-
* {
54-
* const moduleMatches =
55-
* description.module == "" + node.source.value ||
56-
* description.alternativeModules?.includes("" + node.source.value) ||
57-
* false;
58-
*/
55+
const fallback =
56+
entryPointAliases[description.module as keyof typeof entryPointAliases];
57+
const fallbackMatches =
58+
exact ?
59+
[]
60+
: source
61+
.find(
62+
j.ImportDeclaration,
63+
(node) =>
64+
(test(node) && fallback?.includes("" + node.source.value)) || false
65+
)
66+
.paths()
67+
.sort(typeImportsFirst);
68+
return j(perfectMatch.concat(...alternativeMatches, ...fallbackMatches));
5969
}

‎scripts/codemods/ac3-to-ac4/src/util/handleModuleRename.ts‎

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@@ -39,6 +39,7 @@ export function handleModuleRename({
3939
function mergeIntoExistingOrRenameImport() {
4040
findImportDeclarationFor({ description: rename.from, context }).forEach(
4141
(sourcePath) => {
42+
console.log("found " + sourcePath.node.source.value);
4243
if (sourcePath.node.source.value == rename.to.module) {
4344
return; // No change needed.
4445
}
@@ -47,6 +48,7 @@ export function handleModuleRename({
4748
let targetImport = findImportDeclarationFor({
4849
description: rename.to,
4950
context,
51+
exact: true,
5052
})
5153
.filter(
5254
(declaration) =>

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