Fix global access of MonacoEnvironment #248075
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There are 3 ways to declare global variables in TypeScript. 1. A global `declare let`. 2. A global `declare var`. 3. Augmenting the global `Window`. There are 4 ways to access global variables in the browser. 1. Using a global identifier. 2. Using the `globalThis` object. 3. Using the `window` object. 4. Using the `self` object. Not all 3 types of global declarations work for all methods to access a global. | | `let` | `var` | `Window` | | ------------ | ----- | ----- | -------- | | global | ✓ | ✓ | | | `globalThis` | | ✓ | | | `window` | | ✓ | ✓ | | `self` | | ✓ | ✓ | So the proper way to declare the global `MonacoEnvironment`, is: ```ts declare global var MonacoEnvironment: Environment | undefined ``` https://www.typescriptlang.org/play/?#code/PQgEB4CcFMDNpgOwMbVAGwJYCMC8AiAEwHsBbfUYAPgFgAoew6ZdAQxlAHN1jtX1QAb3qhRGaABdQAGUkAuUAGcJkTIk4ixAN3agAauwXLV6+ptFqJCWK1SgA6mpIB3IebGjHiIyrUa6HgC+9MEMdGDcvPygtqiKivSyEvQGkPReZuHAoM5OxK6ckvS5iC4AdEnFec5lqVWl+WUZYWAlLkpFdG2NSaC4oADkA-XlqX2Dw13VTWrjQ5kRPHzoACoAFpiKXJ2Ry+ubFTtL-PuKtez0uycbZ830i1GrNx3JdFdPB73982-HH2djb6Td6nGaIOaTe7ZRTQdCwbavGFww6I2Gwc5pOhI9F3LIdOEvejYlEQolojGkrHkryU+jQAAeAAdiJApIJAkA
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When declaring a global variable in TypeScript, using `var` vs `let`/`const` yields different behaviour. A declaration using `var` yields the expected result. See [TypeScript playground](https://www.typescriptlang.org/play/?#code/PQgEB4CcFMDNpgOwMbVAGwJYCMC8AiAEwHsBbfUYAPgFgAoew6ZdAQxlAHN1jtX1QAb3qhRGaABdQAGUkAuUAGcJkTIk4ixAN3agAauwXLV6+ptFqJCWK1SgA6mpIB3IebGjHiIyrUa6HgC+9MEMdGDcvPygtqiKivSyEvQGkPReZuHAoM5OxK6ckvS5iC4AdEnFec5lqVWl+WUZYWAlLkpFdG2NSaC4oADkA-XlqX2Dw13VTWrjQ5kRPHzoACoAFpiKXJ2Ry+ubFTtL-PuKtez0uycbZ830i1GrNx3JdFdPB73982-HH2djb6Td6nGaIOaTe7ZRTQdCwbavGFww6I2Gwc5pOhI9F3LIdOEvejYlEQolojGkrHkryU+jQAAeAAdiJApIJAkA) Refs eslint#19173 Refs microsoft/vscode#248075 Refs typescript-eslint/typescript-eslint#2594 Refs typescript-eslint/typescript-eslint#7941
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CI still seems to be failing |
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I see the failed check on GitHub, but I’m not able to login to Azure to see the logs. |
hediet
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Aug 4, 2025
Tyriar
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Aug 4, 2025
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There are 3 ways to declare global variables in TypeScript.
declare let.declare var.Window.There are 4 ways to access global variables in the browser.
globalThisobject.windowobject.selfobject.Not all 3 types of global declarations work for all methods to access a global.
letvarWindowglobalThiswindowselfSo the proper way to declare the global
MonacoEnvironment, is:https://www.typescriptlang.org/play/?#code/PQgEB4CcFMDNpgOwMbVAGwJYCMC8AiAEwHsBbfUYAPgFgAoew6ZdAQxlAHN1jtX1QAb3qhRGaABdQAGUkAuUAGcJkTIk4ixAN3agAauwXLV6+ptFqJCWK1SgA6mpIB3IebGjHiIyrUa6HgC+9MEMdGDcvPygtqiKivSyEvQGkPReZuHAoM5OxK6ckvS5iC4AdEnFec5lqVWl+WUZYWAlLkpFdG2NSaC4oADkA-XlqX2Dw13VTWrjQ5kRPHzoACoAFpiKXJ2Ry+ubFTtL-PuKtez0uycbZ830i1GrNx3JdFdPB73982-HH2djb6Td6nGaIOaTe7ZRTQdCwbavGFww6I2Gwc5pOhI9F3LIdOEvejYlEQolojGkrHkryU+jQAAeAAdiJApIJAkA