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GeoffreyBooth committed Mar 17, 2024
1 parent f06e855 commit f969dfb
Showing 1 changed file with 11 additions and 15 deletions.
26 changes: 11 additions & 15 deletions doc/api/esm.md
Original file line number Diff line number Diff line change
Expand Up @@ -1087,7 +1087,7 @@ _isImports_, _conditions_)
> 1. If _packageType_ is not **null**, then
> 1. Return _packageType_.
> 2. If `--experimental-detect-module` is enabled and the result of
> **CONTAINS\_MODULE\_SYNTAX**(_source_) is true, then
> **DETECT\_MODULE\_SYNTAX**(_source_) is true, then
> 1. Return _"module"_.
> 3. Return _"commonjs"_.
> 11. If _url_ does not have any extension, then
Expand Down Expand Up @@ -1124,20 +1124,16 @@ _isImports_, _conditions_)
> 1. Throw an _Invalid Package Configuration_ error.
> 4. Return the parsed JSON source of the file at _pjsonURL_.
**CONTAINS\_MODULE\_SYNTAX**(_source_)
> 1. Parse _source_ as a CommonJS module.
> 2. If the parse is successful, return **false**.
> 3. Else inspect the error message thrown. Return **true** if it is a syntax
> error thrown by any of the following:
> * `import` statement (static only, _not_ dynamic `import()`)
> * `export` statement
> * `import.meta`
> * `await` at the top level
> * A lexical redeclaration of any of the CommonJS wrapper variables
> (`require`, `exports`, `module`, `__filename`, `__dirname`) at the top
> level
> 4. Else return **false**.
**DETECT\_MODULE\_SYNTAX**(_source_)
> 1. Parse _source_ as an ECMAScript module.
> 2. If the parse is successful, then
> 1. If _source_ contains top-level `await`, static `import` or `export`
statements, or `import.meta`, return *true*.
> 2. If _source_ contains a top-level lexical declaration (`const`, `let`,
or `class`) of any of the CommonJS wrapper variables (`require`,
`exports`, `module`, `__filename`, or `__dirname`) then return *true*.
> 3. Else return *false*.
### Customizing ESM specifier resolution algorithm
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