google/closure-compiler

Closure compiler fails to parse "interface" as parameter name

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#2,852 opened on Mar 15, 2018

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P3Parserhelp wanted

Description

Closure compiler is unable to parse "interface" being used as the name of a parameter. This code does successfully execute in Chrome, Safari, and Firefox devtools.

(function x(interface) { console.log(interface); })('test')

https://closure-compiler.appspot.com/home#code%3D%252F%252F%2520%253D%253DClosureCompiler%253D%253D%250A%252F%252F%2520%2540compilation_level%2520ADVANCED_OPTIMIZATIONS%250A%252F%252F%2520%2540output_file_name%2520default.js%250A%252F%252F%2520%2540formatting%2520pretty_print%250A%252F%252F%2520%253D%253D%252FClosureCompiler%253D%253D%250A%250A(function%2520x(interface)%2520%257B%2520console.log(interface)%253B%2520%257D)('test')

Contributor guide

Tech stack
javascriptjava
Domain
tooling
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
clear
Prerequisites
basic JavaScriptunderstanding of parsers
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40
Research direction
Investigate the Closure Compiler parser code, likely in files like JsDocInfoParser.java or JSTypeRegistry.java, to identify where 'interface' is incorrectly treated as a reserved keyword. Check the list of reserved words and ensure that parameter names are allowed to be 'interface'. Look at how other reserved words that are not actually reserved in JavaScript (e.g., 'int') are handled.