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📄 no-unnecessary-type-conversion.ts

📊 Analysis Summary

Metric Count
🔧 Functions 178
📦 Imports 9
📊 Variables & Constants 11
📑 Type Aliases 2

📚 Table of Contents

🛠️ File Location:

📂 packages/eslint-plugin/src/rules/no-unnecessary-type-conversion.ts

📦 Imports

Name Source
TSESTree @typescript-eslint/utils
RuleFix @typescript-eslint/utils/ts-eslint
RuleFixer @typescript-eslint/utils/ts-eslint
AST_NODE_TYPES @typescript-eslint/utils
createRule ../util
getConstrainedTypeAtLocation ../util
getParserServices ../util
getWrappingFixer ../util
isTypeFlagSet ../util

Variables & Constants

Name Type Kind Value Exported
outerNode any const isDoubleOperator ? node.parent : node ✗
wrappingFixerParams { node: any; innerNode: any[]; sourceCode: any; } const `{
node: outerNode,
innerNode: [node.argument],
sourceCode: context.sourceCode,
}` ✗
wrappingFixerParams { node: TSESTree.AssignmentExpression; innerNode: any[]; sourceCode: any; } const `{
node,
innerNode: [node.left],
sourceCode: context.sourceCode,
}` ✗
wrappingFixerParams { node: TSESTree.BinaryExpression; innerNode: any[]; sourceCode: any; } const `{
node,
innerNode: [node.left],
sourceCode: context.sourceCode,
}` ✗
wrappingFixerParams { node: TSESTree.BinaryExpression; innerNode: any[]; sourceCode: any; } const `{
node,
innerNode: [node.right],
sourceCode: context.sourceCode,
}` ✗
nodeCallee any const node.callee ✗
builtInTypeFlags { BigInt: any; Boolean: any; Number: any; String: any; } const `{
BigInt: ts.TypeFlags.BigIntLike,
Boolean: ts.TypeFlags.BooleanLike,
Number: ts.TypeFlags.NumberLike,
String: ts.TypeFlags.StringLike,
}` ✗
typeFlag any const builtInTypeFlags[nodeCallee.name as keyof typeof builtInTypeFlags] ✗
wrappingFixerParams { node: TSESTree.CallExpression; innerNode: any[]; sourceCode: any; } const `{
node,
innerNode: [node.arguments[0]],
sourceCode: context.sourceCode,
}` ✗
memberExpr TSESTree.MemberExpression const node.parent as TSESTree.MemberExpression ✗
wrappingFixerParams { node: any; innerNode: any[]; sourceCode: any; } const `{
node: memberExpr.parent,
innerNode: [memberExpr.object],
sourceCode: context.sourceCode,
}` ✗

Functions

doesUnderlyingTypeMatchFlag(type: ts.Type, typeFlag: ts.TypeFlags): boolean

Code 
function doesUnderlyingTypeMatchFlag(
      type: ts.Type,
      typeFlag: ts.TypeFlags,
    ): boolean {
      return tsutils
        .unionConstituents(type)
        .every(t => isTypeFlagSet(t, typeFlag));
    }
  • Parameters:
  • type: ts.Type
  • typeFlag: ts.TypeFlags
  • Return Type: boolean
  • Calls:
  • tsutils .unionConstituents(type) .every
  • isTypeFlagSet (from ../util)

handleUnaryOperator(node: TSESTree.UnaryExpression, typeFlag: ts.TypeFlags, typeString: 'boolean' | 'number', violation: string, isDoubleOperator: boolean): void

Code 
function handleUnaryOperator(
      node: TSESTree.UnaryExpression,
      typeFlag: ts.TypeFlags,
      typeString: 'boolean' | 'number',
      violation: string,
      isDoubleOperator: boolean, // !! or ~~
    ) {
      const outerNode = isDoubleOperator ? node.parent : node;
      const type = services.getTypeAtLocation(node.argument);
      if (doesUnderlyingTypeMatchFlag(type, typeFlag)) {
        const wrappingFixerParams = {
          node: outerNode,
          innerNode: [node.argument],
          sourceCode: context.sourceCode,
        };

        context.report({
          loc: {
            start: outerNode.loc.start,
            end: {
              column: node.loc.start.column + 1,
              line: node.loc.start.line,
            },
          },
          messageId: 'unnecessaryTypeConversion',
          data: { type: typeString, violation },
          suggest: [
            {
              messageId: 'suggestRemove',
              fix: getWrappingFixer(wrappingFixerParams),
            },
            {
              messageId: 'suggestSatisfies',
              data: { type: typeString },
              fix: getWrappingFixer({
                ...wrappingFixerParams,
                wrap: expr => `${expr} satisfies ${typeString}`,
              }),
            },
          ],
        });
      }
    }
  • Parameters:
  • node: TSESTree.UnaryExpression
  • typeFlag: ts.TypeFlags
  • typeString: 'boolean' | 'number'
  • violation: string
  • isDoubleOperator: boolean
  • Return Type: void
  • Calls:
  • services.getTypeAtLocation
  • doesUnderlyingTypeMatchFlag
  • context.report
  • getWrappingFixer (from ../util)

wrap(expr: string): string

Code 
expr => `${expr} satisfies ${typeString}`
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wrap(expr: string): string

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expr => `${expr} satisfies ${typeString}`
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wrap(expr: string): string

Code 
expr => `${expr} satisfies ${typeString}`
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wrap(expr: string): string

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expr => `${expr} satisfies ${typeString}`
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wrap(expr: string): string

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expr => `${expr} satisfies ${typeString}`
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wrap(expr: string): string

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expr => `${expr} satisfies ${typeString}`
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wrap(expr: string): string

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expr => `${expr} satisfies ${typeString}`
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wrap(expr: string): string

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expr => `${expr} satisfies ${typeString}`
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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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expr => `${expr} satisfies ${typeString}`
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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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expr => `${expr} satisfies string`
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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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expr => `${expr} satisfies string`
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wrap(expr: string): string

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expr => `${expr} satisfies string`
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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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expr => `${expr} satisfies ${typeString}`
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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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expr => `${expr} satisfies string`
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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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expr => `${expr} satisfies string`
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wrap(expr: string): string

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expr => `${expr} satisfies ${typeString}`
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wrap(expr: string): string

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wrap(expr: string): string

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expr => `${expr} satisfies ${typeString}`
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wrap(expr: string): string

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wrap(expr: string): string

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expr => `${expr} satisfies ${typeString}`
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wrap(expr: string): string

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expr => `${expr} satisfies ${typeString}`
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wrap(expr: string): string

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expr => `${expr} satisfies ${typeString}`
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wrap(expr: string): string

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expr => `${expr} satisfies ${typeString}`
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wrap(expr: string): string

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wrap(expr: string): string

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expr => `${expr} satisfies string`
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wrap(expr: string): string

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expr => `${expr} satisfies string`
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wrap(expr: string): string

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expr => `${expr} satisfies string`
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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

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wrap(expr: string): string

Code 
expr => `${expr} satisfies string`
  • Parameters:
  • expr: string
  • Return Type: string

wrap(expr: string): string

Code 
expr => `${expr} satisfies string`
  • Parameters:
  • expr: string
  • Return Type: string

wrap(expr: string): string

Code 
expr => `${expr} satisfies string`
  • Parameters:
  • expr: string
  • Return Type: string

wrap(expr: string): string

Code 
expr => `${expr} satisfies string`
  • Parameters:
  • expr: string
  • Return Type: string

wrap(expr: string): string

Code 
expr => `${expr} satisfies string`
  • Parameters:
  • expr: string
  • Return Type: string

wrap(expr: string): string

Code 
expr => `${expr} satisfies string`
  • Parameters:
  • expr: string
  • Return Type: string

wrap(expr: string): string

Code 
expr => `${expr} satisfies string`
  • Parameters:
  • expr: string
  • Return Type: string

wrap(expr: string): string

Code 
expr => `${expr} satisfies string`
  • Parameters:
  • expr: string
  • Return Type: string

wrap(expr: string): string

Code 
expr => `${expr} satisfies string`
  • Parameters:
  • expr: string
  • Return Type: string

wrap(expr: string): string

Code 
expr => `${expr} satisfies string`
  • Parameters:
  • expr: string
  • Return Type: string

wrap(expr: string): string

Code 
expr => `${expr} satisfies string`
  • Parameters:
  • expr: string
  • Return Type: string

wrap(expr: string): string

Code 
expr => `${expr} satisfies string`
  • Parameters:
  • expr: string
  • Return Type: string

wrap(expr: string): string

Code 
expr => `${expr} satisfies ${typeString}`
  • Parameters:
  • expr: string
  • Return Type: string

wrap(expr: string): string

Code 
expr => `${expr} satisfies ${typeString}`
  • Parameters:
  • expr: string
  • Return Type: string

wrap(expr: string): string

Code 
expr => `${expr} satisfies ${typeString}`
  • Parameters:
  • expr: string
  • Return Type: string

wrap(expr: string): string

Code 
expr => `${expr} satisfies ${typeString}`
  • Parameters:
  • expr: string
  • Return Type: string

wrap(expr: string): string

Code 
expr => `${expr} satisfies ${typeString}`
  • Parameters:
  • expr: string
  • Return Type: string

wrap(expr: string): string

Code 
expr => `${expr} satisfies ${typeString}`
  • Parameters:
  • expr: string
  • Return Type: string

wrap(expr: string): string

Code 
expr => `${expr} satisfies ${typeString}`
  • Parameters:
  • expr: string
  • Return Type: string

wrap(expr: string): string

Code 
expr => `${expr} satisfies ${typeString}`
  • Parameters:
  • expr: string
  • Return Type: string

wrap(expr: string): string

Code 
expr => `${expr} satisfies string`
  • Parameters:
  • expr: string
  • Return Type: string

wrap(expr: string): string

Code 
expr => `${expr} satisfies string`
  • Parameters:
  • expr: string
  • Return Type: string

wrap(expr: string): string

Code 
expr => `${expr} satisfies string`
  • Parameters:
  • expr: string
  • Return Type: string

wrap(expr: string): string

Code 
expr => `${expr} satisfies string`
  • Parameters:
  • expr: string
  • Return Type: string

wrap(expr: string): string

Code 
expr => `${expr} satisfies string`
  • Parameters:
  • expr: string
  • Return Type: string

wrap(expr: string): string

Code 
expr => `${expr} satisfies string`
  • Parameters:
  • expr: string
  • Return Type: string

wrap(expr: string): string

Code 
expr => `${expr} satisfies string`
  • Parameters:
  • expr: string
  • Return Type: string

wrap(expr: string): string

Code 
expr => `${expr} satisfies string`
  • Parameters:
  • expr: string
  • Return Type: string

Type Aliases

Options

type Options = [];

MessageIds

type MessageIds = | 'suggestRemove'
  | 'suggestSatisfies'
  | 'unnecessaryTypeConversion';