graphql-schema-utils

Extensions for graphql-js to support diffing and merging types and schemas.

Getting Started

Install it

npm install --save graphql-schema-utils

Require it

# graphql-js prototypes are automatically extended
require('graphql-schema-utils');

Use it

# Operate on GraphQLSchemas
const thisSchema = buildSchema(...);
const otherSchema = buildSchema(...);
const diffs = schema1.diff(schema2);
const mergedSchema = schema1.merge(schema2);

# Operate on GraphQL types
const thisType = new GraphQLObjectType(...);
const otherType = new GraphQLObjectType(...);
const diffs = thisType.diff(otherType);
const mergedType = thisType.merge(otherType);

API Docs

Classes

GraphQLSchema: GraphQL schema.
GraphQLUnionType: GraphQL union type.
GraphQLObjectType: GraphQL object type.
GraphQLInterfaceType: GraphQL interface type.
GraphQLScalarType: GraphQL scalar type.
GraphQLEnumType: GraphQL enum type.
GraphQLInputObjectType: GraphQL input object type.
GraphQLDiff: Object containing metadata about a diff between two GraphQL types.

Constants

DiffType : Object: Constants representing valid types of GraphQLDiffs.

GraphQLSchema

GraphQL schema.

Kind: global external
See: https://github.com/graphql/graphql-js/blob/master/src/type/schema.js

GraphQLSchema
- .diff(other, [options]) ⇒ Array.<GraphQLDiff>
- .merge(other) ⇒ GraphQLSchema

graphQLSchema.diff(other, [options]) ⇒ `Array.<GraphQLDiff>`

Reports differences between this GraphQLSchema and another one by diffing all of the types.

Kind: instance method of GraphQLSchema
Returns: Array.<GraphQLDiff> - array of differences between the schemas

Param	Type	Default	Description
other	`GraphQLSchema`		another GraphQLSchema
[options]	`Object`		optional properties to modify the behavior of the diff operation
[options.labelForThis]	`String`	`"this schema"`	specifies a custom name to refer to the schema on which .diff(...) was called.
[options.labelForOther]	`String`	`"other schema"`	specifies a custom name to refer to the schema against which this schema is being diffed.

graphQLSchema.merge(other) ⇒ `GraphQLSchema`

Merge this GraphQLSchema with another one. This schema's types and fields take precedence over other's. Does not modify either schema, but instead returns a new one.

Kind: instance method of GraphQLSchema
Returns: GraphQLSchema - new GraphQLSchema representing this merged with other

Param	Type	Description
other	`GraphQLSchema`	another GraphQLSchema to merge with this one

GraphQLUnionType

GraphQL union type.

Kind: global external
See: https://github.com/graphql/graphql-js/blob/master/src/type/definition.js

GraphQLUnionType
- .diff(other, [options]) ⇒ Array.<GraphQLDiff>
- .merge(other) ⇒ GraphQLUnionType

graphQLUnionType.diff(other, [options]) ⇒ `Array.<GraphQLDiff>`

Reports differences between this GraphQLUnionType and another GraphQLUnionType.

Kind: instance method of GraphQLUnionType
Returns: Array.<GraphQLDiff> - array of differences

Param	Type	Default	Description
other	`GraphQLUnionType`		another GraphQLUnionType
[options]	`Object`		optional properties to modify the behavior of the diff operation
[options.labelForThis]	`String`	`"this type"`	specifies a custom name to refer to the object on which .diff(...) was called.
[options.labelForOther]	`String`	`"other type"`	specifies a custom name to refer to the object against which this object is being diffed.

graphQLUnionType.merge(other) ⇒ `GraphQLUnionType`

Merges this GraphQLUnionType with another GraphQLUnionType by taking the union of the types included in both.

Kind: instance method of GraphQLUnionType
Returns: GraphQLUnionType - a new GraphQLUnionType resulting from merging this and other

Param	Description
other	another GraphQLUnionType to merge with this one

GraphQLObjectType

GraphQL object type.

Kind: global external
See: https://github.com/graphql/graphql-js/blob/master/src/type/definition.js

GraphQLObjectType
- .diff(other, [options]) ⇒ Array.<GraphQLDiff>
- .merge(other) ⇒ GraphQLObjectType | GraphQLInterfaceType | GraphQLInputObjectType

graphQLObjectType.diff(other, [options]) ⇒ `Array.<GraphQLDiff>`

Reports differences between this GraphQLObjectType, GraphQLInterfaceType, or GraphQLInputObjectType and another. Fields and implemented interfaces are compared.

Kind: instance method of GraphQLObjectType Returns: Array.<GraphQLDiff> - array of differences

Param	Type	Default	Description
other	`GraphQLObjectType` \| `GraphQLInterfaceType` \| `GraphQLInputObjectType`		another GraphQLObjectType, GraphQLInterfaceType, or GraphQLInputObjectType
[options]	`Object`		optional properties to modify the behavior of the diff operation
[options.labelForThis]	`String`	`"this type"`	specifies a custom name to refer to the object on which .diff(...) was called.
[options.labelForOther]	`String`	`"other type"`	specifies a custom name to refer to the object against which this object is being diffed.

graphQLObjectType.merge(other) ⇒ `GraphQLObjectType` | `GraphQLInterfaceType` | `GraphQLInputObjectType`

Merges another GraphQLObjectType or GraphQLInterfaceType with this one by taking the union of all fields in both types, overwriting this type's fields with the other's if there are conflicts. For GraphQLObjectTypes, implemented interfaces are also merged.

Kind: instance method of GraphQLObjectType Returns: GraphQLObjectType | GraphQLInterfaceType | GraphQLInputObjectType - a new graphql type resulting from merging this and other

Param	Description
other	another GraphQL type to merge with this one

GraphQLInterfaceType

GraphQL interface type.

Kind: global external
See: https://github.com/graphql/graphql-js/blob/master/src/type/definition.js

GraphQLInterfaceType
- .diff(other, [options]) ⇒ Array.<GraphQLDiff>
- .merge(other) ⇒ GraphQLObjectType | GraphQLInterfaceType | GraphQLInputObjectType

graphQLInterfaceType.diff(other, [options]) ⇒ `Array.<GraphQLDiff>`

Reports differences between this GraphQLObjectType, GraphQLInterfaceType, or GraphQLInputObjectType and another. Fields and implemented interfaces are compared.

Kind: instance method of GraphQLInterfaceType Returns: Array.<GraphQLDiff> - array of differences

Param	Type	Default	Description
other	`GraphQLObjectType` \| `GraphQLInterfaceType` \| `GraphQLInputObjectType`		another GraphQLObjectType, GraphQLInterfaceType, or GraphQLInputObjectType
[options]	`Object`		optional properties to modify the behavior of the diff operation
[options.labelForThis]	`String`	`"this type"`	specifies a custom name to refer to the object on which .diff(...) was called.
[options.labelForOther]	`String`	`"other type"`	specifies a custom name to refer to the object against which this object is being diffed.

graphQLInterfaceType.merge(other) ⇒ `GraphQLObjectType` | `GraphQLInterfaceType` | `GraphQLInputObjectType`

Kind: instance method of GraphQLInterfaceType Returns: GraphQLObjectType | GraphQLInterfaceType | GraphQLInputObjectType - a new graphql type resulting from merging this and other

Param	Description
other	another GraphQL type to merge with this one

GraphQLScalarType

GraphQL scalar type.

Kind: global external
See: https://github.com/graphql/graphql-js/blob/master/src/type/definition.js

graphQLScalarType.diff(other, [options]) ⇒ `Array.<GraphQLDiff>`

Reports differences between this GraphQLScalarType and another.

Kind: instance method of GraphQLScalarType
Returns: Array.<GraphQLDiff> - array of differences

Param	Type	Default	Description
other	`GraphQLScalarType`		another GraphQLScalarType
[options]	`Object`		optional properties to modify the behavior of the diff operation
[options.labelForThis]	`String`	`"this type"`	specifies a custom name to refer to the object on which .diff(...) was called.
[options.labelForOther]	`String`	`"other type"`	specifies a custom name to refer to the object against which this object is being diffed.

GraphQLEnumType

GraphQL enum type.

Kind: global external
See: https://github.com/graphql/graphql-js/blob/master/src/type/definition.js

GraphQLEnumType
- .diff(other, [options]) ⇒ Array.<GraphQLDiff>
- .merge(other) ⇒ GraphQLList | GraphQLNonNull | GraphQLScalarType | GraphQLEnumType

graphQLEnumType.diff(other, [options]) ⇒ `Array.<GraphQLDiff>`

Reports differences between this GraphQLEnumType and another. The name and enum values are compared.

Kind: instance method of GraphQLEnumType
Returns: Array.<GraphQLDiff> - array of differences

Param	Type	Default	Description
other	`GraphQLEnumType`		another GraphQLEnumType
[options]	`Object`		optional properties to modify the behavior of the diff operation
[options.labelForThis]	`String`	`"this type"`	specifies a custom name to refer to the object on which .diff(...) was called.
[options.labelForOther]	`String`	`"other type"`	specifies a custom name to refer to the object against which this object is being diffed.

graphQLEnumType.merge(other) ⇒ `GraphQLList` | `GraphQLNonNull` | `GraphQLScalarType` | `GraphQLEnumType`

Merges a type by simply overwriting this type with other if it exists.

Kind: instance method of GraphQLEnumType
Returns: GraphQLList | GraphQLNonNull | GraphQLScalarType | GraphQLEnumType - other if it exists, otherwise this.

Param	Type	Description
other	`GraphQLList` \| `GraphQLNonNull` \| `GraphQLScalarType` \| `GraphQLEnumType`	another GraphQL type object to merge with this

GraphQLInputObjectType

GraphQL input object type.

Kind: global external
See: https://github.com/graphql/graphql-js/blob/master/src/type/definition.js

GraphQLInputObjectType
- .diff(other, [options]) ⇒ Array.<GraphQLDiff>
- .merge(other) ⇒ GraphQLObjectType | GraphQLInterfaceType | GraphQLInputObjectType

graphQLInputObjectType.diff(other, [options]) ⇒ `Array.<GraphQLDiff>`

Reports differences between this GraphQLObjectType, GraphQLInterfaceType, or GraphQLInputObjectType and another. Fields and implemented interfaces are compared.

Kind: instance method of GraphQLInputObjectType
Returns: Array.<GraphQLDiff> - array of differences

Param	Type	Default	Description
other	`GraphQLObjectType` \| `GraphQLInterfaceType` \| `GraphQLInputObjectType`		another GraphQLObjectType, GraphQLInterfaceType, or GraphQLInputObjectType
[options]	`Object`		optional properties to modify the behavior of the diff operation
[options.labelForThis]	`String`	`"this type"`	specifies a custom name to refer to the object on which .diff(...) was called.
[options.labelForOther]	`String`	`"other type"`	specifies a custom name to refer to the object against which this object is being diffed.

graphQLInputObjectType.merge(other) ⇒ `GraphQLObjectType` | `GraphQLInterfaceType` | `GraphQLInputObjectType`

Kind: instance method of GraphQLInputObjectType
Returns: GraphQLObjectType | GraphQLInterfaceType | GraphQLInputObjectType - a new graphql type resulting from merging this and other

Param	Description
other	another GraphQL type to merge with this one

GraphQLDiff

Object containing metadata about a diff between two GraphQL types.

Kind: global class

new GraphQLDiff(thisType, otherType, diffType, description, backwardsCompatible)

Create a new instance of a GraphQLDiff, containing metadata about a difference between two GraphQL types.

Param	Type	Description
thisType	`GraphQLObjectType` \| `GraphQLScalarType` \| `GraphQLEnumType` \| `GraphQLNonNull` \| `GraphQLList` \| `GraphQLUnionType`	the GraphQL type instance on which the `diff` method was executed
otherType	`GraphQLObjectType` \| `GraphQLScalarType` \| `GraphQLEnumType` \| `GraphQLNonNull` \| `GraphQLList` \| `GraphQLUnionType`	the GraphQL type instance which was compared to thisType
diffType	`string`	the specific kind of difference between thisType and otherType
description	`string`
backwardsCompatible	`boolean`	true if this is a non-breaking change when interpreted as thisType changing to otherType

DiffType : `Object`

Constants representing valid types of GraphQLDiffs.

Kind: global constant

graphql-schema-utils

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