80 lines
1.7 KiB
JavaScript
80 lines
1.7 KiB
JavaScript
// @flow
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import { logEntryPolyfills } from "./debug";
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import { createImport, isPolyfillSource, isRequire } from "./utils";
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type Plugin = {
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visitor: Object,
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pre: Function,
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post: Function,
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name: string,
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};
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export default function({ types: t }: { types: Object }): Plugin {
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function replaceWithPolyfillImports(
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path: Object,
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polyfills: Array<string> | Set<string>,
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regenerator: boolean,
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): void {
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if (regenerator) {
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createImport(path, "regenerator-runtime");
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}
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const items = Array.isArray(polyfills) ? new Set(polyfills) : polyfills;
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for (const p of Array.from(items).reverse()) {
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createImport(path, p);
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}
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path.remove();
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}
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const isPolyfillImport = {
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ImportDeclaration(path, state) {
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if (
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path.node.specifiers.length === 0 &&
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isPolyfillSource(path.node.source.value)
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) {
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this.importPolyfillIncluded = true;
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replaceWithPolyfillImports(
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path,
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state.opts.polyfills,
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state.opts.regenerator,
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);
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}
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},
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Program(path, state) {
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path.get("body").forEach(bodyPath => {
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if (isRequire(t, bodyPath)) {
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replaceWithPolyfillImports(
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bodyPath,
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state.opts.polyfills,
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state.opts.regenerator,
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);
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}
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});
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},
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};
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return {
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name: "transform-polyfill-require",
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visitor: isPolyfillImport,
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pre() {
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this.numPolyfillImports = 0;
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this.importPolyfillIncluded = false;
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},
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post() {
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const { debug, onDebug, polyfills } = this.opts;
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if (debug) {
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logEntryPolyfills(
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this.importPolyfillIncluded,
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polyfills,
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this.file.opts.filename,
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onDebug,
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);
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}
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},
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};
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}
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