[pull] main from facebook:main #142
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see test fixtures --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/facebook/react/pull/33144). * #33146 * #33145 * __->__ #33144
`Environment.ts` is getting complex so let's separate test / playground parsing logic from it --- [//]: # (BEGIN SAPLING FOOTER) Stack created with [Sapling](https://sapling-scm.com). Best reviewed with [ReviewStack](https://reviewstack.dev/facebook/react/pull/33145). * #33146 * __->__ #33145
(Almost) all pragmas are now one of the following: - `@...TestOnly`: custom pragma for test fixtures - `@<configName>` | `@<configName>:true`: enables with either true or a default enabled value - `@<configName>:<json value>`
…33139) New take on #29716 ## Summary Template literals consisting entirely of constant values will be inlined to a string literal, effectively replacing the backticks with a double quote. This is done primarily to make the resulting instruction a string literal, so it can be processed further in constant propatation. So this is now correctly simplified to `true`: ```js `` === "" // now true `a${1}` === "a1" // now true ``` If a template string literal can only partially be comptime-evaluated, it is not that useful for dead code elimination or further constant folding steps and thus, is left as-is in that case. Same is true if the literal contains an array, object, symbol or function. ## How did you test this change? See added tests.
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