Can someone explain the significance of tslint's "no-use-before-declare" rule warning, which states that it requires type information? I've tried researching online but still don't fully understand its implications.
Can someone explain the significance of tslint's "no-use-before-declare" rule warning, which states that it requires type information? I've tried researching online but still don't fully understand its implications.
Update: There have been recent changes since this question was posted - the --type-check flag has now been deprecated. You should now be able to use the following command:
tslint --project tsconfig.json src/**/**.ts
The original answer is provided below.
It seems that you will not be able to activate the no-use-before-declare rule unless you execute the commands with both the --type-check and the --project flags. The enforcement of rule violations may rely on specific processes initiated by these flag combinations.
tslint --type-check --project tslint.json src/**/**.ts
Modern TypeScript no longer commonly uses the rule mentioned here due to its slow computation. According to this source:
The rule is most relevant when var keyword is used, as the compiler can automatically detect if a block-scoped let and const variable is utilized before declaration. With the decline of var usage in modern TypeScript, this rule is now deemed unnecessary and kept for legacy reasons. It's known to have performance issues, not included in default configuration presets, and should not influence TSLint design choices.
If you come across this warning message in your VSCode editor, the solution is simple: remove the specified rule from your tslint.json file. This advice aligns with what is stated in the FAQ section of the vscode-tslint plugin:
Starting from tslint version 5, the rule no-unused-variable necessitates type information. As vscode-tslint does not support rules requiring type information at the moment (see issue #70), it is suggested to enable the TypeScript compiler options noUnusedLocals and noUnusedParameters in your tsconfig.json as a workaround.
When using TSLint version 5.10.0 and newer, you must ensure TSLint is directed to your TypeScript configuration file. This can be done by specifying the --project flag:
tslint --project tsconfig.json --config tslint.json \"src/**/*.ts\"
It's important to differentiate between tsconfig.json and tslint.json, as some users have already made this mistake, as reported here.
You can find all TSLint CLI options documented on this page. The use of --type-check is no longer necessary since it was deprecated in TSLint v5.8.0.
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