120 lines
5.1 KiB
JSON
120 lines
5.1 KiB
JSON
{
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"rules": {
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// -- Strict errors --
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// These lint rules are likely always a good idea.
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// Force function overloads to be declared together. This ensures readers understand APIs.
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"adjacent-overload-signatures": true,
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// Do not allow the subtle/obscure comma operator.
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"ban-comma-operator": true,
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// Do not allow internal modules or namespaces . These are deprecated in favor of ES6 modules.
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"no-namespace": true,
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// Do not allow parameters to be reassigned. To avoid bugs, developers should instead assign new values to new vars.
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"no-parameter-reassignment": true,
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// Force the use of ES6-style imports instead of /// <reference path=> imports.
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"no-reference": true,
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"semicolon": [true, "never"],
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// Do not allow type assertions that do nothing. This is a big warning that the developer may not understand the
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// code currently being edited (they may be incorrectly handling a different type case that does not exist).
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"no-unnecessary-type-assertion": true,
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// Disallow nonsensical label usage.
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"label-position": true,
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// Disallows the (often typo) syntax if (var1 = var2). Replace with if (var2) { var1 = var2 }.
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"no-conditional-assignment": true,
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// Disallows constructors for primitive types (e.g. new Number('123'), though Number('123') is still allowed).
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"no-construct": true,
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// Do not allow super() to be called twice in a constructor.
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"no-duplicate-super": true,
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// Do not allow the same case to appear more than once in a switch block.
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"no-duplicate-switch-case": true,
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// Do not allow a variable to be declared more than once in the same block. Consider function parameters in this
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// rule.
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"no-duplicate-variable": [true, "check-parameters"],
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// Disallows a variable definition in an inner scope from shadowing a variable in an outer scope. Developers should
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// instead use a separate variable name.
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"no-shadowed-variable": true,
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// Empty blocks are almost never needed. Allow the one general exception: empty catch blocks.
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"no-empty": [true, "allow-empty-catch"],
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// Functions must either be handled directly (e.g. with a catch() handler) or returned to another function.
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// This is a major source of errors in Cloud Functions and the team strongly recommends leaving this rule on.
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"no-floating-promises": true,
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// Do not allow any imports for modules that are not in package.json. These will almost certainly fail when
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// deployed.
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"no-implicit-dependencies": true,
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// The 'this' keyword can only be used inside of classes.
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"no-invalid-this": true,
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// Do not allow strings to be thrown because they will not include stack traces. Throw Errors instead.
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"no-string-throw": true,
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// Disallow control flow statements, such as return, continue, break, and throw in finally blocks.
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"no-unsafe-finally": true,
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// Do not allow variables to be used before they are declared.
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"no-use-before-declare": true,
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// Expressions must always return a value. Avoids common errors like const myValue = functionReturningVoid();
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"no-void-expression": [true, "ignore-arrow-function-shorthand"],
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// Disallow duplicate imports in the same file.
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"no-duplicate-imports": true,
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// -- Strong Warnings --
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// These rules should almost never be needed, but may be included due to legacy code.
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// They are left as a warning to avoid frustration with blocked deploys when the developer
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// understand the warning and wants to deploy anyway.
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// Warn when an empty interface is defined. These are generally not useful.
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"no-empty-interface": {"severity": "warning"},
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// Warn when an import will have side effects.
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"no-import-side-effect": {"severity": "warning"},
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// Warn when variables are defined with var. Var has subtle meaning that can lead to bugs. Strongly prefer const for
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// most values and let for values that will change.
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"no-var-keyword": {"severity": "warning"},
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// Prefer === and !== over == and !=. The latter operators support overloads that are often accidental.
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"triple-equals": {"severity": "warning"},
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// Warn when using deprecated APIs.
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"deprecation": {"severity": "warning"},
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// -- Light Warnigns --
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// These rules are intended to help developers use better style. Simpler code has fewer bugs. These would be "info"
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// if TSLint supported such a level.
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// prefer for( ... of ... ) to an index loop when the index is only used to fetch an object from an array.
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// (Even better: check out utils like .map if transforming an array!)
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"prefer-for-of": {"severity": "warning"},
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// Warns if function overloads could be unified into a single function with optional or rest parameters.
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"unified-signatures": {"severity": "warning"},
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// Prefer const for values that will not change. This better documents code.
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"prefer-const": {"severity": "warning"},
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// Multi-line object liiterals and function calls should have a trailing comma. This helps avoid merge conflicts.
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"trailing-comma": {"severity": "warning"}
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},
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"defaultSeverity": "error"
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}
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