add defineConfig/loadConfig to pgkit package

Author: mmkal

packages/pgkit/package.json

@@ -32,6 +32,7 @@
     "vitest": "^1.2.2"
   },
   "dependencies": {
-    "@pgkit/client": "workspace:^"
+    "@pgkit/client": "workspace:^",
+    "importx": "^0.4.4"
   }
 }

packages/pgkit/src/config.ts

@@ -0,0 +1,51 @@
+import * as fs from 'fs'
+import * as path from 'path'
+
+export type Config = {
+  client: {
+    connectionString: string
+  }
+  typegen?: {
+    connectionString?: string
+  }
+  migrator?: {
+    connectionString?: string
+    /** @default '${cwd}/migrations' */
+    migrationsTableName?: string
+    /** @default 'migrations' */
+    migrationsPath?: string
+  }
+}
+
+export const defineConfig = (config: Config) => config
+
+export const loadConfig = async () => {
+  const importx = await import('importx')
+  const configLocations = ['pgkit.config.ts', 'pgkit.config.js']
+  let config: Config | undefined
+  let cwd = process.cwd()
+  while (!config) {
+    for (const configLocation of configLocations) {
+      const filepath = path.join(cwd, configLocation)
+      if (fs.existsSync(filepath)) {
+        config = await importx.import(filepath, {
+          parentURL: new URL(`file://${cwd}`),
+        })
+        if ((config as {default?: Config}).default) {
+          config = (config as {default?: Config}).default
+        }
+        if (!config) {
+          throw new Error(`Config file ${filepath} doesn't export a valid config object.`)
+        }
+        break
+      }
+    }
+    cwd = path.dirname(cwd)
+  }
+
+  if (!config) {
+    throw new Error(`No config file found. Try creating one at ${path.join(cwd, configLocations[0])}`)
+  }
+
+  return config
+}

pgkit.config.ts

@@ -0,0 +1,5 @@
+export default {
+    client: {
+        connectionString: 'postgresql://postgres:postgres@localhost:5432/postgres',
+    },
+} satisfies import('./packages/pgkit/src/config').Config