deno2node/lib/_transformations/shim.js

`tsc` replacement for transpiling Deno libraries to run on Node.js.

export const shimFile = (shimFile) => {
    const shims = Array.from(shimFile.getExportedDeclarations().keys());
    return (sourceFile) => {
        if (sourceFile === shimFile)
            return;
        const locals = new Set(sourceFile.getLocals().map((l) => l.getEscapedName()));
        const index = sourceFile.getStatementsWithComments().length;
        const moduleSpecifier = "./" +
            sourceFile.getRelativePathTo(shimFile).replace(/tsx?$/, "js");
        sourceFile.insertImportDeclaration(index, {
            // do not shim declared locals
            namedImports: shims.filter((s) => !locals.has(s)),
            moduleSpecifier,
        });
    };
};
const isNodeSpecific = (sourceFile) => sourceFile.getBaseNameWithoutExtension().toLowerCase().endsWith(".node");
export function shimEverything(ctx) {
    if (!ctx.config.shim)
        return;
    console.time("Shimming");
    const shim = shimFile(ctx.project.addSourceFileAtPath(ctx.resolve(ctx.config.shim)));
    for (const sourceFile of ctx.project.getSourceFiles()) {
        if (!isNodeSpecific(sourceFile)) {
            shim(sourceFile);
        }
    }
    console.timeEnd("Shimming");
}