René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Should the strict-mode status of a file be dependent on its external module status","articleBody":"With #4811 merged we've decoupled ES6 module emit from the ES6 language level, allowing us to emit other module forms when targeting ES6. This brings up another interesting question - we parse _all_ external modules in strict mode, ES6 or not, when this is only a requirement for ES6 modules. Should we fix this and make the parse dependent on the module selection? Or should we emit `\"use strict\";` in non-ES6 forms so reality matches the parser? Even before #4811 we've actually had this wrong:\n\n``` ts\nimport * as foo from \"./foo\";\n\nwith (foo) {\n\n}\n```\n\nWe forbid the `with` as per strict mode, but we're emitting an amd module _without_ a `\"use strict\";` indicator. To be correct, when not targeting es6 modules, we should either disable strict mode when parsing or emit a `\"use strict\";`.\n","author":{"url":"https://github.com/weswigham","@type":"Person","name":"weswigham"},"datePublished":"2015-09-25T00:23:50.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/4963/TypeScript/issues/4963"}