103 lines
2.7 KiB
JavaScript
103 lines
2.7 KiB
JavaScript
function isPolyfillSource(value) {
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return value === "babel-polyfill" || value === "core-js";
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}
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export default function ({ types: t }) {
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function createImportDeclaration(polyfill) {
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const declar = t.importDeclaration([], t.stringLiteral(polyfill));
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declar._blockHoist = 3;
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return declar;
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}
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function createRequireStatement(polyfill) {
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return t.expressionStatement(
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t.callExpression(
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t.identifier("require"),
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[
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t.stringLiteral(polyfill)
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]
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)
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);
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}
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function isRequire(path) {
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return t.isExpressionStatement(path.node) &&
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t.isCallExpression(path.node.expression) &&
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t.isIdentifier(path.node.expression.callee) &&
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path.node.expression.callee.name === "require" &&
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path.node.expression.arguments.length === 1 &&
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t.isStringLiteral(path.node.expression.arguments[0]) &&
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isPolyfillSource(path.node.expression.arguments[0].value);
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}
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function createImport(polyfill, requireType, core) {
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if (core) {
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polyfill = `core-js/modules/${polyfill}`;
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}
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if (requireType === "import") {
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return createImportDeclaration(polyfill);
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} else {
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return createRequireStatement(polyfill);
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}
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}
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function createImports(polyfills, requireType, regenerator) {
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const imports = polyfills
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.filter((el, i, arr) => arr.indexOf(el) === i)
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.map((polyfill) => createImport(polyfill, requireType, true));
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return [
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...imports,
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regenerator && createImport("regenerator-runtime/runtime", requireType)
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].filter(Boolean);
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}
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const isPolyfillImport = {
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ImportDeclaration(path, state) {
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if (path.node.specifiers.length === 0 &&
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isPolyfillSource(path.node.source.value)) {
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this.numPolyfillImports++;
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if (this.numPolyfillImports > 1) {
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path.remove();
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return;
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}
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path.replaceWithMultiple(
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createImports(state.opts.polyfills, "import", 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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if (!state.opts.polyfills) {
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throw path.buildCodeFrameError(`
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There was an issue in "babel-preset-env" such that
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the "polyfills" option was not correctly passed
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to the "transform-polyfill-require" plugin
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`);
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}
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path.get("body").forEach((bodyPath) => {
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if (isRequire(bodyPath)) {
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this.numPolyfillImports++;
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if (this.numPolyfillImports > 1) {
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path.remove();
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return;
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}
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bodyPath.replaceWithMultiple(
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createImports(state.opts.polyfills, "require", 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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}
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};
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}
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