v3.0.0

Breaking

• (t.object) Add additionalProperties: false by default when properties are defined (#5): bc4dc26
  This is breaking because when additionalProperties is left unspecified, JSON schema treats it as additionalProperties: true.
  It was changed to match the "schema" concept, in that users generally only want to allow the properties known/defined in their schema. To allow extra properties, simply add additionalProperties: true in the options parameter:

  // Accept any object
  t.object(); 
  //-> { type: "object" }
  
  // Accept an object of defined shape
  t.object({
    name: t.string(),
  });
  //-> {
  //->   type: "object",
  //->   additionalProperties: false, // <<
  //->   required: ["name"],
  //->   properties: {
  //->     name: { type: "string" }
  //->   }
  //-> }
  
  // Accept an object of given shape, but allow extra properties
  t.object({
    name: t.string(),
  }, {
    additionalProperties: true,
  });
  //-> {
  //->   type: "object",
  //->   additionalProperties: true, // <<
  //->   required: ["name"],
  //->   properties: {
  //->     name: { type: "string" }
  //->   }
  //-> }

• (t.tuple) Modify JSON schema output to enforce tuple length (#7): bf3663a
  While this could be classified as a patch fix, it's technically breaking as the default 2.x output generated looser JSON schema tuple definitions which, by default, allowed for fewer and/or extra items to still be considered valid. This doesn't match the TypeScript (or most languages') concept of a tuple, so this release's t.tuple() default output has been changed.
  However, minItems and maxItems are still configurable thru options if you wish to change them.

  t.tuple([t.string(), t.number()]);
  
  // Before (2.x)
  // Allows any array length
  //-> {
  //->   type: "array",
  //->   prefixItems: [
  //->     { type: "string" },
  //->     { type: "number" },
  //->   }]
  //-> }
  
  // After (3.0)
  // Requires 2 items
  //-> {
  //->   type: "array",
  //->   prefixItems: [
  //->     { type: "string" },
  //->     { type: "number" },
  //->   }],
  //->   minItems: 2,
  //->   maxItems: 2
  //-> }

Chores

• Add zod-to-json-schema to benchmark: 4a27c67

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Full Changelog: v2.1.0...v3.0.0