pygy / unpkgify

Takes JS source code, and turns raw ES module specifiers into unpkg urls

esm-unpkgify

usage

import {unpkgify} from "esm-unpkgify"

console.log(unpkgify(`
import {foo, ffoo as feefoo} from "foo"
import * as bar /*annoying comment*/ from "bar"
import {wont, be, changed} from "https://fully.qualified.url/some-file"

function getBaz(){return import("baz")}

ignoreStrings(\`import * as x from "leftAlone"\`)
`))

prints

import {foo, ffoo as feefoo} from "https://unpkg.com/foo?module"
import * as bar /*annoying comment*/  from "https://unpkg.com/bar?module"
import {wont, be, changed} from "https://fully.qualified.url/some-file"

function getBaz(){return import("https://unpkg.com/baz?module")}

ignoreStrings(`import * as x from "leftAlone"`)

Limitations:

This uses a degenerate parser which doesn't understant regexps, but is otherwise robust (provided valid JS is passed in).

So const r = /import * as star from "star"/ will be turned into const r = /import * as star from "https://unpkg.com/star?module"/. Provided that RegExps of that form are very unlikely to happen in real code (unlike /import \* as star .../ which is not affected), this is deemed an acceptable tradeof.