const { init, parse } = require('es-module-lexer');

(async () => {
  // either await init, or call parse asynchronously
  // this is necessary for the Web Assembly boot
  await init;

  const source = 'export var p = 5';
  const [imports, exports] = parse(source);
  
  // Returns "p"
  source.slice(exports[0].s, exports[0].e);
  // Returns "p"
  source.slice(exports[0].ls, exports[0].le);
})();

import { init, parse } from 'es-module-lexer';

(async () => {
  await init;

  const source = `
    import { name } from 'mod\\u1011';
    import json from './json.json' assert { type: 'json' }
    export var p = 5;
    export function q () {

    };
    export { x as 'external name' } from 'external';

    // Comments provided to demonstrate edge cases
    import /*comment!*/ (  'asdf', { assert: { type: 'json' }});
    import /*comment!*/.meta.asdf;
  `;

  const [imports, exports] = parse(source, 'optional-sourcename');

  // Returns "modထ"
  imports[0].n
  // Returns "mod\u1011"
  source.slice(imports[0].s, imports[0].e);
  // "s" = start
  // "e" = end

  // Returns "import { name } from 'mod'"
  source.slice(imports[0].ss, imports[0].se);
  // "ss" = statement start
  // "se" = statement end

  // Returns "{ type: 'json' }"
  source.slice(imports[1].a, imports[1].se);
  // "a" = assert, -1 for no assertion

  // Returns "external"
  source.slice(imports[2].s, imports[2].e);

  // Returns "p"
  source.slice(exports[0].s, exports[0].e);
  // Returns "p"
  source.slice(exports[0].ls, exports[0].le);
  // Returns "q"
  source.slice(exports[1].s, exports[1].e);
  // Returns "q"
  source.slice(exports[1].ls, exports[1].le);
  // Returns "'external name'"
  source.slice(exports[2].s, exports[2].e);
  // Returns -1
  exports[2].ls;
  // Returns -1
  exports[2].le;

  // Dynamic imports are indicated by imports[2].d > -1
  // In this case the "d" index is the start of the dynamic import bracket
  // Returns true
  imports[2].d > -1;

  // Returns "asdf" (only for string literal dynamic imports)
  imports[2].n
  // Returns "import /*comment!*/ (  'asdf', { assert: { type: 'json' } })"
  source.slice(imports[3].ss, imports[3].se);
  // Returns "'asdf'"
  source.slice(imports[3].s, imports[3].e);
  // Returns "(  'asdf', { assert: { type: 'json' } })"
  source.slice(imports[3].d, imports[3].se);
  // Returns "{ assert: { type: 'json' } }"
  source.slice(imports[3].a, imports[3].se - 1);

  // For non-string dynamic import expressions:
  // - n will be undefined
  // - a is currently -1 even if there is an assertion
  // - e is currently the character before the closing )

  // For nested dynamic imports, the se value of the outer import is -1 as end tracking does not
  // currently support nested dynamic immports

  // import.meta is indicated by imports[3].d === -2
  // Returns true
  imports[4].d === -2;
  // Returns "import /*comment!*/.meta"
  source.slice(imports[4].s, imports[4].e);
  // ss and se are the same for import meta
})();

import { parse } from 'es-module-lexer/js';

const [,, facade] = parse(`
  export * from 'external';
  import * as ns from 'external2';
  export { a as b } from 'external3';
  export { ns };
`);
facade === true;

// Only "a" is detected as an export, "q" isn't
export var a = 'asdf', q = z;

// "b" is not detected as an export
export var { a: b } = asdf;