Function rewriteImportDeclarations

src/javascript/transpile.ts:187–214

(
  output: Sourcemap,
  body: Node,
  resolve: (specifier: string) => string = String
)

}

function rewriteImportDeclarations(
  output: Sourcemap,
  body: Node,
  resolve: (specifier: string) => string = String
): void {
  const declarations: ImportDeclaration[] = [];

  simple(body, {
    ImportDeclaration(node) {
      if (isStringLiteral(node.source)) {
        declarations.push(node);
      }
    }
  });

  const specifiers: string[] = [];
  const imports: string[] = [];
  for (const node of declarations) {
    output.delete(node.start, node.end + +(output.input[node.end] === "\n"));
    specifiers.push(rewriteImportSpecifiers(node));
    imports.push(`import(${annotatePath(resolve(getStringLiteralValue(node.source as StringLiteral)))})`);
  }
  if (declarations.length > 1) {
    output.insertLeft(0, `const [${specifiers.join(", ")}] = await Promise.all([${imports.join(", ")}]);\n`);
  } else if (declarations.length === 1) {
    output.insertLeft(0, `const ${specifiers[0]} = await ${imports[0]};\n`);
  }
}

function rewriteImportSpecifiers(node: ImportDeclaration): string {
  return node.specifiers.some(isNotNamespaceSpecifier)