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Comparing version 4.0.0-rc.11 to 4.0.0-rc.12

2

LICENSE.md
The MIT License (MIT)
=====================
Copyright © `2017` Benjie Gillam
Copyright © `2018` Benjie Gillam

@@ -6,0 +6,0 @@ Permission is hereby granted, free of charge, to any person

@@ -26,6 +26,6 @@ "use strict";

// eslint-disable-next-line no-console
console.warn(`Recoverable error occurred; use envvar 'DEBUG="graphile-build:warn"' for full error\n> ${errorSnippet}…`);
console.warn(`Recoverable error occurred; use envvar 'DEBUG="graphile-build:warn"' for full error (see: http://graphile.org/postgraphile/debugging )\n> ${errorSnippet}…`);
} else {
// eslint-disable-next-line no-console
console.warn(`Recoverable error occurred; use envvar 'DEBUG="graphile-build:warn"' for error`);
console.warn(`Recoverable error occurred; use envvar 'DEBUG="graphile-build:warn"' for error (see: http://graphile.org/postgraphile/debugging )`);
}

@@ -32,0 +32,0 @@ debugWarn(e);

{
"name": "graphile-build",
"version": "4.0.0-rc.11",
"version": "4.0.0-rc.12",
"description": "Build a GraphQL schema from plugins",

@@ -35,3 +35,3 @@ "main": "node8plus/index.js",

"debug": ">=2 <3",
"graphql-parse-resolve-info": "4.0.0-rc.11",
"graphql-parse-resolve-info": "4.0.0-rc.12",
"lodash": ">=4 <5",

@@ -38,0 +38,0 @@ "lru-cache": ">=4 <5",

# graphile-build
graphile-build provides a framework to build high-performance extensible
GraphQL APIs by combining plugins and using advanced query look-ahead features.
Each plugin would typically have it's own small purpose (such as implementing
the Node interface, or adding `query: Query` to mutation payloads, or watching
an external source for schema changes) and by combining these plugins together
you get a large, powerful, and manageable GraphQL schema. Plugins enable you
to make broad changes to your GraphQL schema with minimal code and without
sacrificing performance.
<span class="badge-patreon"><a href="https://patreon.com/benjie" title="Support Graphile development on Patreon"><img src="https://img.shields.io/badge/donate-via%20Patreon-orange.svg" alt="Patreon donate button" /></a></span>
[![Discord chat room](https://img.shields.io/discord/489127045289476126.svg)](http://discord.gg/graphile)
[![Package on npm](https://img.shields.io/npm/v/graphile-build.svg?style=flat)](https://www.npmjs.com/package/graphile-build)
![MIT license](https://img.shields.io/npm/l/graphile-build.svg)
[![Follow](https://img.shields.io/badge/twitter-@GraphileHQ-blue.svg)](https://twitter.com/GraphileHQ)
An example of an application built on `graphile-build` is [PostGraphile
v4+](https://github.com/graphile/postgraphile) which allows you to run just one
command to instantly get a fully working and secure GraphQL API up and running
based on your PostgreSQL database schema. The `graphile-build-pg` module
contains the plugins that are specific to PostgreSQL support (`graphile-build`
itself does not know about databases).
`graphile-build` is the core of Graphile Engine. It provides a framework to
build high-performance extensible GraphQL APIs by combining plugins and using
advanced query look-ahead features. Each plugin typically has its own small
purpose (such as implementing the Node interface, adding `query: Query` to
mutation payloads, or watching an external source for schema changes) and by
combining these plugins together you get a large, powerful, and manageable
GraphQL schema. Plugins enable you to make broad changes to your GraphQL
schema with minimal code and without sacrificing performance.
An example of an application built on `graphile-build` is
[PostGraphile](https://github.com/graphile/postgraphile) which with one
command connects to your PostgreSQL database and provides a full highly
performant standards-compliant GraphQL API. The separate `graphile-build-pg`
module contains the plugins that are specific to PostgreSQL support
(`graphile-build` itself does not know about databases).
**For in-depth documentation about `graphile-build`, please see [the graphile
documentation website](https://www.graphile.org/).** The below just serves as a
limited quick-reference for people already familiar with the library.
documentation website at graphile.org](https://www.graphile.org/).** The
below just serves as a limited quick-reference for people already familiar
with the library.
**Please note: rather than using the very raw plugin interface as shown below,
you may want to use the helpers in `graphile-utils`.**
## Usage
The following [runnable example][] creates a plugin that hooks the
'GraphQLObjectType:fields' event in the system and adds a 'random' field to
every object everywhere (including the root Query).
```js
const { buildSchema, defaultPlugins } = require("graphile-build");
// or import { buildSchema, defaultPlugins } from 'graphile-build';
// Create a simple plugin that adds a random field to every GraphQLObject
function MyRandomFieldPlugin(
builder,
{ myDefaultMin = 1, myDefaultMax = 100 }
) {
builder.hook("GraphQLObjectType:fields", (fields, build) => {
const {
extend,
graphql: { GraphQLInt },
} = build;
return extend(fields, {
random: {
type: GraphQLInt,
args: {
sides: {
type: GraphQLInt,
},
},
resolve(_, { sides = myDefaultMax }) {
return (
Math.floor(Math.random() * (sides + 1 - myDefaultMin)) +
myDefaultMin
);
},
},
});
});
}
// ----------------------------------------
const { graphql } = require("graphql");
(async function() {
// Create our GraphQL schema by applying all the plugins
const schema = await buildSchema([...defaultPlugins, MyRandomFieldPlugin], {
// ... options
myDefaultMin: 1,
myDefaultMax: 6,
});
// Run our query
const result = await graphql(
schema,
`
query {
random
}
`,
null,
{}
);
console.log(result); // { data: { random: 4 } }
})().catch(e => {
console.error(e);
process.exit(1);
});
```
## Plugins
Plugins can be asynchronous functions (simply define them as `async function MyPlugin(builder, options) {...}` or return a Promise object).
When a plugin first runs, it should do any of its asynchronous work, and then
return. Schema generation itself (i.e. firing of hooks) is synchronous
(deliberately).
Most plugins will be of the form:
```js
function MyRandomPlugin(builder) {
builder.hook("HOOK_NAME_HERE", (
// 'inputValue' - the value to replace with the return result
inputValue,
// 'build' - a frozen collection of utils and stores for this build,
// not available during the 'build' event
{ extend /* ... */ },
// 'context' - more information about the current object
{ scope: { isMyRandomObject /* ... */ } /* ... */ }
) => {
if (!isMyRandomObject) {
// Exit early if this doesn't have the scope we want
return inputValue;
}
return extend(inputValue, {
// add additional attributes here...
});
});
}
```
[runnable example]: examples/README-1.js
**Please note: rather than using the raw plugin interface that
`graphile-build` exposes, you may want to use the helpers in
the `graphile-utils` module.**

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