helpers

@amritk/helpers

Shared schema-traversal and runtime helpers for the mjst code generation ecosystem.

         

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Overview

@amritk/helpers is the shared utility belt used by mjst's generators and by the runtime code those generators produce. Each helper is published as its own subpath export so consumers (and generated output) only pull in what they need — no barrel, no incidental dependencies.

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Installation

npm install @amritk/helpers
# or
pnpm add @amritk/helpers
# or
yarn add @amritk/helpers
# or
bun add @amritk/helpers

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Modules

Schema traversal

Subpath	Exports	Purpose
@amritk/helpers/extract-refs	extractRefs	Collect every $ref reachable from a schema.
@amritk/helpers/resolve-ref	resolveRef	Resolve a $ref — JSON Pointer, $anchor name, or URI — against a root schema.
@amritk/helpers/build-anchor-map	buildAnchorMap	Build a map of $anchor / $dynamicAnchor name → JSON Pointer.
@amritk/helpers/build-dynamic-ref-map	buildDynamicRefMap	Build a map of $dynamicAnchor → resolved location.
@amritk/helpers/resolve-dynamic-refs	resolveDynamicRefs	Replace $dynamicRef occurrences using the map above.
@amritk/helpers/assert-id-scopes	assertIdScopes	Reject a document whose $id-scoped fragment ref resolves to nothing in its own resource.
@amritk/helpers/max-schema-depth	MAX_SCHEMA_DEPTH, assertSchemaDepth	The nesting cap every recursive walker enforces.
@amritk/helpers/upgrade-draft07-schema	upgradeDraft07Schema, isDraft07Schema	Upgrade a Draft-07 schema to 2020-12.
@amritk/helpers/ref-to-filename	refToFilename, toKebabCase	Convert a $ref to a stable filename.
@amritk/helpers/ref-to-name	refToName	Convert a $ref to a TypeScript identifier (PascalCase).
@amritk/helpers/schema-guards	isSchemaObject, hasType, hasProperties, hasOneOf, hasAnyOf, hasAllOf, hasEnum, hasConst, hasPattern, hasFormat, hasDefault, hasExamples, hasRequired, hasItems, hasAdditionalProperties, hasMinLength, hasMaxLength, hasMinimum, hasMaximum, hasExclusiveMinimum, hasExclusiveMaximum, hasMultipleOf, hasMinItems, hasMaxItems, hasUniqueItems, hasMinProperties, hasMaxProperties, …	Type-narrowing predicates for JSON Schema keywords.

Codegen utilities

Subpath	Exports	Purpose
@amritk/helpers/generate-type-definition	generateTypeDefinition	Render a TypeScript type from a schema node.
@amritk/helpers/mjst-extension	MJST_EXTENSION_KEY, getMjstInstanceOf, getMjstPrimitive, getMjstBrand	Read the x-mjst vendor hints (instanceOf, primitive, brand) a schema carries.
@amritk/helpers/parse-documentation	parseDocumentation, ObjectDocumentation	Parse a markdown doc file into per-property descriptions.

Runtime helpers (also copied into generated output)

Subpath	Exports	Purpose
@amritk/helpers/is-object	isObject	Narrow unknown → Record<string, unknown>.
@amritk/helpers/safe-accessor	safeAccessor	Read a key from an unknown value without throwing.
@amritk/helpers/validate-array	validateArray	Validate array shape and items.
@amritk/helpers/validate-record	validateRecord	Validate record shape and additional properties.

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Usage

import { resolveRef } from '@amritk/helpers/resolve-ref'
import { isObjectSchema, hasProperties } from '@amritk/helpers/schema-guards'

const node = resolveRef('#/$defs/info', rootSchema)

if (isObjectSchema(node) && hasProperties(node)) {
  for (const [name, property] of Object.entries(node.properties)) {
    // ...
  }
}

Each helper has its own colocated test file (*.test.ts) — read those for canonical examples.

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Related packages

• @amritk/generate-parsers — primary consumer
• @amritk/generate-validators — primary consumer
• @amritk/mjst — the CLI surface

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License

MIT