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Lint Rules

noPrecisionLoss (since v11.0.0)

Disallow literal numbers that lose precision

Examples

Invalid

const x = 9007199254740993
nursery/noPrecisionLoss.js:1:11 lint/nursery/noPrecisionLoss ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ This number literal will lose precision at runtime.
  
  > 1 │ const x = 9007199254740993
      │           ^^^^^^^^^^^^^^^^
    2 │ 
  
  ℹ The value at runtime will be 9007199254740992
  

const x = 5123000000000000000000000000001
nursery/noPrecisionLoss.js:1:11 lint/nursery/noPrecisionLoss ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ This number literal will lose precision at runtime.
  
  > 1 │ const x = 5123000000000000000000000000001
      │           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    2 │ 
  
  ℹ The value at runtime will be 5123000000000000000000000000000
  

const x = 1230000000000000000000000.0
nursery/noPrecisionLoss.js:1:11 lint/nursery/noPrecisionLoss ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ This number literal will lose precision at runtime.
  
  > 1 │ const x = 1230000000000000000000000.0
      │           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
    2 │ 
  
  ℹ The value at runtime will be 1230000000000000000000000
  

const x = .1230000000000000000000000
nursery/noPrecisionLoss.js:1:11 lint/nursery/noPrecisionLoss ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ This number literal will lose precision at runtime.
  
  > 1 │ const x = .1230000000000000000000000
      │           ^^^^^^^^^^^^^^^^^^^^^^^^^^
    2 │ 
  
  ℹ The value at runtime will be 0.123
  

const x = 0X20000000000001
nursery/noPrecisionLoss.js:1:11 lint/nursery/noPrecisionLoss ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ This number literal will lose precision at runtime.
  
  > 1 │ const x = 0X20000000000001
      │           ^^^^^^^^^^^^^^^^
    2 │ 
  
  ℹ The value at runtime will be 9007199254740992
  

const x = 0X2_000000000_0001;
nursery/noPrecisionLoss.js:1:11 lint/nursery/noPrecisionLoss ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ This number literal will lose precision at runtime.
  
  > 1 │ const x = 0X2_000000000_0001;
      │           ^^^^^^^^^^^^^^^^^^
    2 │ 
  
  ℹ The value at runtime will be 9007199254740992

Valid

const x = 12345
const x = 123.456
const x = 123e34
const x = 12300000000000000000000000
const x = 0x1FFFFFFFFFFFFF
const x = 9007199254740991
const x = 9007_1992547409_91