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📄 no-unsafe-unary-minus

📊 Analysis Summary

Metric	Count
🔧 Functions	1
📑 Type Aliases	2

📚 Table of Contents

• Default Export
• Functions
• Type Aliases

🛠️ File Location:

📂 packages/eslint-plugin/src/rules/no-unsafe-unary-minus.ts

📤 Default Export

export default util.createRule<Options, MessageIds>({ ... })

Property	Value
name	'no-unsafe-unary-minus'
meta.type	'problem'
meta.docs.description	'Require unary negation to take a number'
meta.docs.recommended	'recommended'
meta.docs.requiresTypeChecking	true
meta.messages.unaryMinus	'Argument of unary negation should be assignable to number | bigint but is {{type}} instead.'
meta.schema	[]
defaultOptions	[]

Entry point: create — documented under Functions.

---

Functions

create(context: any): { UnaryExpression(node: any): void; }

Parameters:

• context any

Returns: { UnaryExpression(node: any): void; }

Calls:

• util.getParserServices
• util.getConstrainedTypeAtLocation
• services.program.getTypeChecker
• tsutils .unionConstituents(argType) .some
• tsutils.isTypeFlagSet
• context.report
• checker.typeToString

Code

create(context) {
    return {
      UnaryExpression(node): void {
        if (node.operator !== '-') {
          return;
        }
        const services = util.getParserServices(context);
        const argType = util.getConstrainedTypeAtLocation(
          services,
          node.argument,
        );
        const checker = services.program.getTypeChecker();
        if (
          tsutils
            .unionConstituents(argType)
            .some(
              type =>
                !tsutils.isTypeFlagSet(
                  type,
                  ts.TypeFlags.Any |
                    ts.TypeFlags.Never |
                    ts.TypeFlags.BigIntLike |
                    ts.TypeFlags.NumberLike,
                ),
            )
        ) {
          context.report({
            node,
            messageId: 'unaryMinus',
            data: { type: checker.typeToString(argType) },
          });
        }
      },
    };
  }

---

Type Aliases

Options

type Options = [];

MessageIds

type MessageIds = 'unaryMinus';

---

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