/
misc.ts
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/
misc.ts
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/**
* @fileoverview Really small utility functions that didn't deserve their own files
*/
import {
AST_NODE_TYPES,
TSESLint,
TSESTree,
} from '@typescript-eslint/experimental-utils';
/**
* Check if the context file name is *.d.ts or *.d.tsx
*/
function isDefinitionFile(fileName: string): boolean {
return /\.d\.tsx?$/i.test(fileName || '');
}
/**
* Upper cases the first character or the string
*/
function upperCaseFirst(str: string): string {
return str[0].toUpperCase() + str.slice(1);
}
type InferOptionsTypeFromRuleNever<T> = T extends TSESLint.RuleModule<
never,
infer TOptions
>
? TOptions
: unknown;
/**
* Uses type inference to fetch the TOptions type from the given RuleModule
*/
type InferOptionsTypeFromRule<T> = T extends TSESLint.RuleModule<
string,
infer TOptions
>
? TOptions
: InferOptionsTypeFromRuleNever<T>;
/**
* Uses type inference to fetch the TMessageIds type from the given RuleModule
*/
type InferMessageIdsTypeFromRule<T> = T extends TSESLint.RuleModule<
infer TMessageIds,
unknown[]
>
? TMessageIds
: unknown;
/** Return true if both parameters are equal. */
type Equal<T> = (a: T, b: T) => boolean;
function arraysAreEqual<T>(
a: T[] | undefined,
b: T[] | undefined,
eq: (a: T, b: T) => boolean,
): boolean {
return (
a === b ||
(a !== undefined &&
b !== undefined &&
a.length === b.length &&
a.every((x, idx) => eq(x, b[idx])))
);
}
/** Returns the first non-`undefined` result. */
function findFirstResult<T, U>(
inputs: T[],
getResult: (t: T) => U | undefined,
): U | undefined {
for (const element of inputs) {
const result = getResult(element);
if (result !== undefined) {
return result;
}
}
return undefined;
}
/**
* Gets a string representation of the name of the index signature.
*/
export function getNameFromIndexSignature(
node: TSESTree.TSIndexSignature,
): string {
const propName: TSESTree.PropertyName | undefined = node.parameters.find(
(parameter: TSESTree.Parameter): parameter is TSESTree.Identifier =>
parameter.type === AST_NODE_TYPES.Identifier,
);
return propName ? propName.name : '(index signature)';
}
/**
* Gets a string name representation of the name of the given MethodDefinition
* or ClassProperty node, with handling for computed property names.
*/
function getNameFromMember(
member:
| TSESTree.MethodDefinition
| TSESTree.TSMethodSignature
| TSESTree.TSAbstractMethodDefinition
| TSESTree.ClassProperty
| TSESTree.TSAbstractClassProperty
| TSESTree.Property
| TSESTree.TSPropertySignature,
sourceCode: TSESLint.SourceCode,
): string {
if (member.key.type === AST_NODE_TYPES.Identifier) {
return member.key.name;
}
if (member.key.type === AST_NODE_TYPES.Literal) {
return `${member.key.value}`;
}
return sourceCode.text.slice(...member.key.range);
}
type ExcludeKeys<
TObj extends Record<string, unknown>,
TKeys extends keyof TObj
> = { [k in Exclude<keyof TObj, TKeys>]: TObj[k] };
type RequireKeys<
TObj extends Record<string, unknown>,
TKeys extends keyof TObj
> = ExcludeKeys<TObj, TKeys> & { [k in TKeys]-?: Exclude<TObj[k], undefined> };
export {
arraysAreEqual,
Equal,
ExcludeKeys,
findFirstResult,
getNameFromMember,
InferMessageIdsTypeFromRule,
InferOptionsTypeFromRule,
isDefinitionFile,
RequireKeys,
upperCaseFirst,
};