Public commit

scripts/plugins/esbuild-browserslist.ts

@@ -0,0 +1,107 @@
+// https://github.com/nihalgonsalves/esbuild-plugin-browserslist
+// MIT License. Copyright (c) 2021 Nihal Gonsalves
+import { z } from "zod"
+import browserslist from "browserslist"
+
+export function getDefaultTarget() {
+  return getTarget(
+    ["Chrome", "Firefox", "Edge", "Safari"].map(browser => `last 2 ${browser} versions`),
+  )
+}
+
+enum BrowserslistKind {
+  Edge = "edge",
+  Firefox = "firefox",
+  Chrome = "chrome",
+  Safari = "safari",
+  iOS = "ios_saf",
+  Android = "android",
+  AndroidChrome = "and_chr",
+  AndroidFirefox = "and_ff",
+  AndroidUC = "and_uc",
+  AndroidQQ = "and_qq",
+  Samsung = "samsung",
+  Opera = "opera",
+  OperaMini = "op_mini",
+  OperaMobile = "op_mob",
+  IE = "ie",
+  IEMobile = "ie_mob",
+  BlackBerry = "bb",
+  Baidu = "baidu",
+  Kaios = "kaios",
+  Node = "node",
+}
+
+const enum EsbuildEngine {
+  Chrome = "chrome",
+  Edge = "edge",
+  ES = "es",
+  Firefox = "firefox",
+  Hermes = "hermes",
+  IE = "ie",
+  IOS = "ios",
+  Node = "node",
+  Opera = "opera",
+  Rhino = "rhino",
+  Safari = "safari",
+}
+
+const BrowserslistEsbuildMapping: Partial<Record<BrowserslistKind, EsbuildEngine>> = {
+  // exact map
+  [BrowserslistKind.Edge]: EsbuildEngine.Edge,
+  [BrowserslistKind.Firefox]: EsbuildEngine.Firefox,
+  [BrowserslistKind.Chrome]: EsbuildEngine.Chrome,
+  [BrowserslistKind.Safari]: EsbuildEngine.Safari,
+  [BrowserslistKind.iOS]: EsbuildEngine.IOS,
+  [BrowserslistKind.Node]: EsbuildEngine.Node,
+  [BrowserslistKind.IE]: EsbuildEngine.IE,
+  [BrowserslistKind.Opera]: EsbuildEngine.Opera,
+  // approximate mapping
+  [BrowserslistKind.Android]: EsbuildEngine.Chrome,
+  [BrowserslistKind.AndroidChrome]: EsbuildEngine.Chrome,
+  [BrowserslistKind.AndroidFirefox]: EsbuildEngine.Firefox,
+  // the rest have no equivalent for esbuild
+}
+
+const BrowserSchema = z.nativeEnum(BrowserslistKind)
+/** 123 or 123.456 or 123.456.789 */
+const VersionSchema = z.string().regex(/^(\d+\.\d+\.\d+|\d+\.\d+|\d+)$/)
+
+export function getTarget(targets: string[]): string[] {
+  const result = browserslist(targets)
+    .map(entry => {
+      const [rawBrowser, rawVersionOrRange] = entry.split(" ")
+
+      const rawVersionNormalized = rawVersionOrRange
+        // e.g. 13.4-13.7, take the lower range
+        ?.replace(/-[\d.]+$/, "")
+        // all => replace with 1
+        ?.replace("all", "1")
+
+      const browserResult = BrowserSchema.safeParse(rawBrowser)
+      const versionResult = VersionSchema.safeParse(rawVersionNormalized)
+
+      if (!browserResult.success || !versionResult.success) {
+        return
+      }
+
+      const { data: browser } = browserResult
+      const { data: version } = versionResult
+
+      const esbuildTarget = BrowserslistEsbuildMapping[browser]
+
+      if (!esbuildTarget) {
+        return
+      }
+
+      return { target: esbuildTarget, version }
+    })
+    .filter(Boolean)
+    .map(({ target, version }) => `${target}${version}`)
+
+  if (result.length === 0) {
+    throw new Error("Could not resolve any esbuild targets")
+  }
+
+  return result
+}