fix: Add flatMap() fallback; fixes #26 (#27)

fix: Add flatMap() fallback; fixes #26
privatenumber · Aug 18, 2020 · 46b616b · 46b616b
1 parent 81e3d82
commit 46b616b
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diff --git a/.github/workflows/nodejs.yml b/.github/workflows/nodejs.yml
@@ -16,7 +16,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [14.x]
+        node-version: [10.x, 14.x]
 
     steps:
     - uses: actions/checkout@v2

diff --git a/src/minify-plugin.js b/src/minify-plugin.js
@@ -3,6 +3,8 @@ const { RawSource, SourceMapSource } = require('webpack-sources')
 const isJsFile = /\.js$/i
 const pluginName = 'esbuild-minify'
 
+const flatMap = (arr, cb) => arr.flatMap ? arr.flatMap(cb) : [].concat(...arr.map(cb))
+
 class ESBuildMinifyPlugin {
   constructor(options) {
     this.options = { ...options }
@@ -39,7 +41,7 @@ class ESBuildMinifyPlugin {
       compilation.hooks.optimizeChunkAssets.tapPromise(
         pluginName,
         async (chunks) => {
-          const transforms = chunks.flatMap((chunk) => {
+          const transforms = flatMap(chunks, (chunk) => {
             return chunk.files
               .filter((file) => isJsFile.test(file))
               .map(async (file) => {