Reference to: Activity 2.01: Building a Heat Map Declaration File
The book description does not show how to compile files.
If we use tsc standart commands, it has an error for @types/jasmine mention : set target to es2015 or later to use "Promise".
Then when we use tsc --target es2015 it throws that we can't use "require".
Then when we update code to use import, lodash and @types/lodash throws incompatibility on run node heat_map.data.js cause node does not find module lodash
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After all I remove .specfile, remove @types/jasmine and use the require imports, that resolvers tsc heat_map_data.ts issues.