1 files changed, 92 insertions, 0 deletions
diff --git a/date-fns/scripts/build/packages.js b/date-fns/scripts/build/packages.js
new file mode 100755
index 0000000..154754c
--- /dev/null
+++ b/date-fns/scripts/build/packages.js
@@ -0,0 +1,92 @@
+#!/usr/bin/env node
+
+/**
+ * @file
+ * The script generates package.json files that points to correct ESM modules
+ * and TypeScript typings.
+ *
+ * It's a part of the build process.
+ */
+
+const { writeFile } = require('mz/fs')
+const path = require('path')
+const listFns = require('../_lib/listFns')
+const listFPFns = require('../_lib/listFPFns')
+const listLocales = require('../_lib/listLocales')
+const rootPath =
+  process.env.PACKAGE_OUTPUT_PATH || path.resolve(process.cwd(), 'tmp/package')
+
+const extraModules = [
+  { fullPath: './src/fp/index.js' },
+  { fullPath: './src/locale/index.js' },
+]
+
+writePackages()
+
+async function writePackages() {
+  const initialPackages = await getInitialPackages()
+  const modules = await listAll()
+  await Promise.all(
+    modules.map(async (module) =>
+      writePackage(module.fullPath, initialPackages[module.fullPath])
+    )
+  )
+  console.log('package.json files are generated')
+}
+
+function writePackage(fullPath, initialPackage) {
+  const dirPath = path.dirname(fullPath)
+  const typingsRelativePath = path.relative(dirPath, `./src/typings.d.ts`)
+  const packagePath = path.resolve(
+    rootPath,
+    `${dirPath.replace('./src/', './')}/package.json`
+  )
+
+  return writeFile(
+    packagePath,
+    JSON.stringify(
+      Object.assign({ sideEffects: false }, initialPackage || {}, {
+        typings: typingsRelativePath,
+      }),
+      null,
+      2
+    )
+  )
+}
+
+async function getInitialPackages() {
+  const fns = await listFns()
+  return fns
+    .concat(listFPFns())
+    .concat(listLocales())
+    .concat(extraModules)
+    .reduce((acc, module) => {
+      acc[module.fullPath] = getModulePackage(module.fullPath)
+      return acc
+    }, {})
+}
+
+function getModulePackage(fullPath) {
+  const dirPath = path.dirname(fullPath)
+  const subPath = dirPath.match(/^\.\/src\/(.+)$/)[1]
+  const esmRelativePath = path.relative(
+    dirPath,
+    `./src/esm/${subPath}/index.js`
+  )
+  return { module: esmRelativePath }
+}
+
+async function listAll() {
+  const fns = await listFns()
+  return fns
+    .concat(listFPFns())
+    .concat(listLocales())
+    .concat(extraModules)
+    .reduce((acc, module) => {
+      const esmModule = Object.assign({}, module, {
+        fullPath: module.fullPath.replace('./src/', './src/esm/'),
+      })
+      return acc.concat([module, esmModule])
+    }, [])
+    .concat([])
+}