deprecate: dynamic import, import.meta, edge polyfills (#450)

.github/workflows/ci.yml

@@ -22,9 +22,9 @@ jobs:
   test-firefox:
     runs-on: windows-latest
     strategy:
+      fail-fast: false
       matrix:
         firefox: [
-          '65.0', # (60 = modules support, but not working)
           '67.0', # import(), import.meta
           '89.0',  # top-level await
           '108.0',
@@ -55,6 +55,7 @@ jobs:
   test-chrome:
     runs-on: windows-latest
     strategy:
+      fail-fast: false
       matrix:
         chrome: [
           '695071', # ~September 2019

README.md

@@ -2,9 +2,9 @@
 
 Polyfills import maps and other ES Modules features on top of the baseline native ESM support in browsers.
 
-With import maps now supported by all major browsers, ES Module Shims entirely bypasses processing for the [91% of users](https://caniuse.com/import-maps) with native import maps support.
+With import maps now supported by all major browsers, ES Module Shims entirely bypasses processing for the [94% of users](https://caniuse.com/import-maps) with native import maps support.
 
-For the remaining users, the highly performant (see [benchmarks](#benchmarks)) production and [CSP-compatible](#csp-support) shim kicks in to rewrite module specifiers driven by the [Web Assembly ES Module Lexer](https://github.com/guybedford/es-module-lexer).
+For the remaining ~4% of users, the highly performant (see [benchmarks](#benchmarks)) production and [CSP-compatible](#csp-support) shim kicks in to rewrite module specifiers driven by the [Web Assembly ES Module Lexer](https://github.com/guybedford/es-module-lexer).
 
 The following modules features are polyfilled:
 
@@ -210,8 +210,8 @@ ES Module Shims is designed for production performance. A [comprehensive benchma
 
 Benchmark summary:
 
-* [ES Module Shims Chrome Passthrough](bench/README.md#chrome-passthrough-performance) (for [72% of users](https://caniuse.com/import-maps)) results in ~5ms extra initialization time over native for ES Module Shims fetching, execution and initialization, and on a slow connection the additional non-blocking bandwidth cost of its 10KB compressed download as expected.
-* [ES Module Shims Polyfilling](bench/README.md#native-v-polyfill-performance) (for the remaining [28% of users](https://caniuse.com/import-maps)) is on average 1.4x - 1.5x slower than native module loading, and up to 1.8x slower on slow networks (most likely due to the browser preloader), both for cached and uncached loads, and this result scales linearly up to 10MB and 20k modules loaded executing on the fastest connection in just over 2 seconds in Firefox.
+* [ES Module Shims Chrome Passthrough](bench/README.md#chrome-passthrough-performance) (for [94% of users](https://caniuse.com/import-maps)) results in ~5ms extra initialization time over native for ES Module Shims fetching, execution and initialization, and on a slow connection the additional non-blocking bandwidth cost of its 10KB compressed download as expected.
+* [ES Module Shims Polyfilling](bench/README.md#native-v-polyfill-performance) (for the remaining [3% of users](https://caniuse.com/import-maps)) is on average 1.4x - 1.5x slower than native module loading, and up to 1.8x slower on slow networks (most likely due to the browser preloader), both for cached and uncached loads, and this result scales linearly up to 10MB and 20k modules loaded executing on the fastest connection in just over 2 seconds in Firefox.
 * [Very large import maps](bench/README.md#large-import-maps-performance) (100s of entries) cost only a few extra milliseconds upfront for the additional loading cost.
 
 ## Features
@@ -222,7 +222,7 @@ Works in all browsers with [baseline ES module support](https://caniuse.com/#fea
 
 Browser Compatibility on baseline ES modules support **with** ES Module Shims:
 
-| ES Modules Features                             | Chrome (71+)                         | Firefox (60+)                        | Safari (10.1+)                       |
+| ES Modules Features                             | Chrome (63+)                         | Firefox (67+)                        | Safari (11.1+)                       |
 | ----------------------------------------------- | ------------------------------------ | ------------------------------------ | ------------------------------------ |
 | [modulepreload](#modulepreload)                 | :heavy_check_mark:                   | :heavy_check_mark:                   | :heavy_check_mark:                   |
 | [Import Maps](#import-maps)                     | :heavy_check_mark:                   | :heavy_check_mark:                   | :heavy_check_mark:                   |

src/env.js

@@ -3,6 +3,8 @@ export const hasDocument = typeof document !== 'undefined';
 
 export const noop = () => {};
 
+export const dynamicImport = (u, errUrl) => import(u);
+
 const optionsScript = hasDocument ? document.querySelector('script[type=esms-options]') : undefined;
 
 export const esmsInitOptions = optionsScript ? JSON.parse(optionsScript.innerHTML) : {};
@@ -50,8 +52,6 @@ export const onpolyfill =
       console.log(`%c^^ Module error above is polyfilled and can be ignored ^^`, 'font-weight:900;color:#391');
     };
 
-export const edge = !navigator.userAgentData && !!navigator.userAgent.match(/Edge\/\d+\.\d+/);
-
 export const baseUrl =
   hasDocument ?
     document.baseURI