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Merge pull request #171 from debrisapron/dynamic-import

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Amend shapeshifter to allow use of dynamic import
This commit is contained in:
Felix Roos 2022-08-04 22:06:38 +02:00 committed by GitHub
commit b864b1dec3
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2 changed files with 20 additions and 2 deletions
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16
packages/eval/shapeshifter.mjs
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@ -34,7 +34,7 @@ export const wrappedAsync = true;
export default (_code) => {
const { code, addReturn } = wrapAsync(_code);
const ast = parseScriptWithLocation(code);
const ast = parseScriptWithLocation(disguiseImports(code));
const artificialNodes = [];
const parents = [];
const shifted = replace(ast.tree, {
@ -128,10 +128,22 @@ export default (_code) => {
if (wrappedAsync) {
addReturn(shifted);
}
const generated = codegen(shifted);
const generated = undisguiseImports(codegen(shifted));
return generated;
};
// renames all import statements to "_mport" as Shift doesn't support dynamic import.
// there shouldn't be any side-effects from this as this change does not affect
// the syntax & will be undone by the equivalent replace in "undisguiseImports".
function disguiseImports(code) {
return code.replaceAll('import', '_mport'); // Must be the same length!
}
// Rename the renamed import statements back to "import"
function undisguiseImports(code) {
return code.replaceAll('_mport', 'import');
}
function wrapAsync(code) {
// wrap code in async to make await work on top level => this will create 1 line offset to locations
// this is why line offset is -1 in getLocationObject calls below

6
packages/eval/test/shapeshifter.test.mjs
View File

@ -11,4 +11,10 @@ describe('shapeshifter', () => {
it('Should shift simple double quote string', () => {
assert.equal(shapeshifter('"c3"'), '(async()=>{return mini("c3").withMiniLocation([1,0,15],[1,4,19])})()');
});
it('Should handle dynamic imports', () => {
assert.equal(
shapeshifter('const { default: foo } = await import(\'https://bar.com/foo.js\');"c3"'),
'(async()=>{const{default:foo}=await import("https://bar.com/foo.js");return mini("c3").withMiniLocation([1,64,79],[1,68,83])})()',
);
});
});