Effect-TS/effect effect@3.13.6

on GitHub

Patch Changes

• #4551 3154ce4 Thanks @gcanti! - Arbitrary: make called on Schema.Class now respects property annotations, closes #4550.

  Previously, when calling Arbitrary.make on a Schema.Class, property-specific annotations (such as arbitrary) were ignored, leading to unexpected values in generated instances.

  Before

  Even though a had an arbitrary annotation, the generated values were random:

  import { Arbitrary, FastCheck, Schema } from "effect"
  
  class Class extends Schema.Class<Class>("Class")({
    a: Schema.NumberFromString.annotations({
      arbitrary: () => (fc) => fc.constant(1)
    })
  }) {}
  
  console.log(FastCheck.sample(Arbitrary.make(Class), 5))
  /*
  Example Output:
  [
    Class { a: 2.6624670822171524e-44 },
    Class { a: 3.4028177873105996e+38 },
    Class { a: 3.402820626847944e+38 },
    Class { a: 3.783505853677006e-44 },
    Class { a: 3243685 }
  ]
  */

  After

  Now, the values respect the arbitrary annotation and return the expected constant:

  import { Arbitrary, FastCheck, Schema } from "effect"
  
  class Class extends Schema.Class<Class>("Class")({
    a: Schema.NumberFromString.annotations({
      arbitrary: () => (fc) => fc.constant(1)
    })
  }) {}
  
  console.log(FastCheck.sample(Arbitrary.make(Class), 5))
  /*
  [
    Class { a: 1 },
    Class { a: 1 },
    Class { a: 1 },
    Class { a: 1 },
    Class { a: 1 }
  ]
  */