Dynamic import is not working (SyntaxError: Unexpected token)

[gseidel]

Seems like acorn is not supporting dynamic import statements. I saw issue #809, but i'm not sure if this is related, because some comments say something about a dependency to npm, but i can reproduce it without npm.

How to reproduce

let acorn = require("acorn");

let code = `async function load() {
    let say = await import('./say.js');
}`;

console.log(acorn.parse(code));

Output

SyntaxError: Unexpected token (2:20)
    at Parser.pp$4.raise (./node_modules/acorn/dist/acorn.js:2927:15)
    at Parser.pp.unexpected (./node_modules/acorn/dist/acorn.js:698:10)
    at Parser.pp$3.parseExprAtom (./node_modules/acorn/dist/acorn.js:2322:21)
    at Parser.pp$3.parseExprSubscripts (./node_modules/acorn/dist/acorn.js:2129:21)
    at Parser.pp$3.parseMaybeUnary (./node_modules/acorn/dist/acorn.js:2106:19)
    at Parser.pp$3.parseAwait (./node_modules/acorn/dist/acorn.js:2912:26)
    at Parser.pp$3.parseMaybeUnary (./node_modules/acorn/dist/acorn.js:2090:19)
    at Parser.pp$3.parseExprOps (./node_modules/acorn/dist/acorn.js:2041:21)
    at Parser.pp$3.parseMaybeConditional (./node_modules/acorn/dist/acorn.js:2024:21)
    at Parser.pp$3.parseMaybeAssign (./node_modules/acorn/dist/acorn.js:1997:21) {
  pos: 44,
  loc: Position { line: 2, column: 20 },
  raisedAt: 50
}

Version
node v12.18.2
acorn 7.3.1

[marijnh]

You have to specify ecmaVersion: 11 to parse dynamic import.

[blaasvaer]

And WHERE do one specify ecmaVersion: 11? I'm using Browserify with Babel and have no clue where to configure specifically for Acorn. I would expect to do all my configuring at the Browserify/Babel level and not at the level of some obscure and deeply nested dependency?

[RReverser]

Babel does not use Acorn, consult the docs of libraries you actually use.