zshy
Version:
Gold-standard build tool for TypeScript libraries
34 lines • 1.77 kB
JavaScript
import * as ts from "typescript";
// Create import.meta shim transformer for CJS builds
export const createImportMetaShimTransformer = () => (context) => {
return (sourceFile) => {
const visitor = (node) => {
// Handle import.meta.url
if (ts.isPropertyAccessExpression(node) &&
ts.isMetaProperty(node.expression) &&
node.expression.keywordToken === ts.SyntaxKind.ImportKeyword &&
node.name.text === "url") {
return ts.factory.createCallExpression(ts.factory.createPropertyAccessExpression(ts.factory.createCallExpression(ts.factory.createIdentifier("require"), undefined, [
ts.factory.createStringLiteral("url"),
]), ts.factory.createIdentifier("pathToFileURL")), undefined, [ts.factory.createIdentifier("__filename")]);
}
// Handle import.meta.dirname
if (ts.isPropertyAccessExpression(node) &&
ts.isMetaProperty(node.expression) &&
node.expression.keywordToken === ts.SyntaxKind.ImportKeyword &&
node.name.text === "dirname") {
return ts.factory.createIdentifier("__dirname");
}
// Handle import.meta.filename
if (ts.isPropertyAccessExpression(node) &&
ts.isMetaProperty(node.expression) &&
node.expression.keywordToken === ts.SyntaxKind.ImportKeyword &&
node.name.text === "filename") {
return ts.factory.createIdentifier("__filename");
}
return ts.visitEachChild(node, visitor, context);
};
return ts.visitNode(sourceFile, visitor);
};
};
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