mirror of
https://github.com/swc-project/swc.git
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256 lines
7.4 KiB
TypeScript
256 lines
7.4 KiB
TypeScript
// Loaded from https://deno.land/x/graphql_deno@v15.0.0/lib/language/printer.js
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import { visit } from './visitor.js';
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import { printBlockString } from './blockString.js';
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/**
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* Converts an AST into a string, using one set of reasonable
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* formatting rules.
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*/
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export function print(ast) {
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return visit(ast, {
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leave: printDocASTReducer
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});
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} // TODO: provide better type coverage in future
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const printDocASTReducer = {
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Name: node => node.value,
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Variable: node => '$' + node.name,
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// Document
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Document: node => join(node.definitions, '\n\n') + '\n',
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OperationDefinition(node) {
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const op = node.operation;
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const name = node.name;
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const varDefs = wrap('(', join(node.variableDefinitions, ', '), ')');
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const directives = join(node.directives, ' ');
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const selectionSet = node.selectionSet; // Anonymous queries with no directives or variable definitions can use
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// the query short form.
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return !name && !directives && !varDefs && op === 'query' ? selectionSet : join([op, join([name, varDefs]), directives, selectionSet], ' ');
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},
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VariableDefinition: ({
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variable,
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type,
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defaultValue,
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directives
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}) => variable + ': ' + type + wrap(' = ', defaultValue) + wrap(' ', join(directives, ' ')),
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SelectionSet: ({
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selections
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}) => block(selections),
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Field: ({
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alias,
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name,
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arguments: args,
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directives,
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selectionSet
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}) => join([wrap('', alias, ': ') + name + wrap('(', join(args, ', '), ')'), join(directives, ' '), selectionSet], ' '),
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Argument: ({
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name,
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value
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}) => name + ': ' + value,
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// Fragments
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FragmentSpread: ({
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name,
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directives
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}) => '...' + name + wrap(' ', join(directives, ' ')),
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InlineFragment: ({
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typeCondition,
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directives,
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selectionSet
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}) => join(['...', wrap('on ', typeCondition), join(directives, ' '), selectionSet], ' '),
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FragmentDefinition: ({
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name,
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typeCondition,
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variableDefinitions,
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directives,
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selectionSet
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}) => // Note: fragment variable definitions are experimental and may be changed
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// or removed in the future.
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`fragment ${name}${wrap('(', join(variableDefinitions, ', '), ')')} ` + `on ${typeCondition} ${wrap('', join(directives, ' '), ' ')}` + selectionSet,
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// Value
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IntValue: ({
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value
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}) => value,
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FloatValue: ({
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value
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}) => value,
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StringValue: ({
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value,
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block: isBlockString
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}, key) => isBlockString ? printBlockString(value, key === 'description' ? '' : ' ') : JSON.stringify(value),
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BooleanValue: ({
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value
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}) => value ? 'true' : 'false',
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NullValue: () => 'null',
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EnumValue: ({
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value
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}) => value,
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ListValue: ({
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values
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}) => '[' + join(values, ', ') + ']',
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ObjectValue: ({
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fields
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}) => '{' + join(fields, ', ') + '}',
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ObjectField: ({
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name,
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value
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}) => name + ': ' + value,
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// Directive
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Directive: ({
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name,
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arguments: args
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}) => '@' + name + wrap('(', join(args, ', '), ')'),
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// Type
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NamedType: ({
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name
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}) => name,
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ListType: ({
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type
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}) => '[' + type + ']',
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NonNullType: ({
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type
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}) => type + '!',
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// Type System Definitions
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SchemaDefinition: addDescription(({
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directives,
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operationTypes
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}) => join(['schema', join(directives, ' '), block(operationTypes)], ' ')),
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OperationTypeDefinition: ({
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operation,
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type
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}) => operation + ': ' + type,
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ScalarTypeDefinition: addDescription(({
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name,
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directives
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}) => join(['scalar', name, join(directives, ' ')], ' ')),
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ObjectTypeDefinition: addDescription(({
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name,
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interfaces,
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directives,
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fields
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}) => join(['type', name, wrap('implements ', join(interfaces, ' & ')), join(directives, ' '), block(fields)], ' ')),
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FieldDefinition: addDescription(({
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name,
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arguments: args,
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type,
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directives
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}) => name + (hasMultilineItems(args) ? wrap('(\n', indent(join(args, '\n')), '\n)') : wrap('(', join(args, ', '), ')')) + ': ' + type + wrap(' ', join(directives, ' '))),
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InputValueDefinition: addDescription(({
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name,
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type,
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defaultValue,
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directives
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}) => join([name + ': ' + type, wrap('= ', defaultValue), join(directives, ' ')], ' ')),
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InterfaceTypeDefinition: addDescription(({
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name,
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interfaces,
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directives,
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fields
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}) => join(['interface', name, wrap('implements ', join(interfaces, ' & ')), join(directives, ' '), block(fields)], ' ')),
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UnionTypeDefinition: addDescription(({
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name,
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directives,
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types
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}) => join(['union', name, join(directives, ' '), types && types.length !== 0 ? '= ' + join(types, ' | ') : ''], ' ')),
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EnumTypeDefinition: addDescription(({
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name,
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directives,
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values
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}) => join(['enum', name, join(directives, ' '), block(values)], ' ')),
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EnumValueDefinition: addDescription(({
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name,
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directives
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}) => join([name, join(directives, ' ')], ' ')),
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InputObjectTypeDefinition: addDescription(({
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name,
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directives,
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fields
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}) => join(['input', name, join(directives, ' '), block(fields)], ' ')),
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DirectiveDefinition: addDescription(({
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name,
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arguments: args,
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repeatable,
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locations
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}) => 'directive @' + name + (hasMultilineItems(args) ? wrap('(\n', indent(join(args, '\n')), '\n)') : wrap('(', join(args, ', '), ')')) + (repeatable ? ' repeatable' : '') + ' on ' + join(locations, ' | ')),
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SchemaExtension: ({
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directives,
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operationTypes
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}) => join(['extend schema', join(directives, ' '), block(operationTypes)], ' '),
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ScalarTypeExtension: ({
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name,
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directives
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}) => join(['extend scalar', name, join(directives, ' ')], ' '),
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ObjectTypeExtension: ({
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name,
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interfaces,
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directives,
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fields
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}) => join(['extend type', name, wrap('implements ', join(interfaces, ' & ')), join(directives, ' '), block(fields)], ' '),
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InterfaceTypeExtension: ({
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name,
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interfaces,
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directives,
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fields
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}) => join(['extend interface', name, wrap('implements ', join(interfaces, ' & ')), join(directives, ' '), block(fields)], ' '),
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UnionTypeExtension: ({
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name,
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directives,
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types
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}) => join(['extend union', name, join(directives, ' '), types && types.length !== 0 ? '= ' + join(types, ' | ') : ''], ' '),
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EnumTypeExtension: ({
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name,
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directives,
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values
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}) => join(['extend enum', name, join(directives, ' '), block(values)], ' '),
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InputObjectTypeExtension: ({
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name,
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directives,
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fields
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}) => join(['extend input', name, join(directives, ' '), block(fields)], ' ')
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};
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function addDescription(cb) {
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return node => join([node.description, cb(node)], '\n');
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}
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/**
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* Given maybeArray, print an empty string if it is null or empty, otherwise
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* print all items together separated by separator if provided
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*/
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function join(maybeArray, separator = '') {
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return maybeArray?.filter(x => x).join(separator) ?? '';
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}
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/**
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* Given array, print each item on its own line, wrapped in an
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* indented "{ }" block.
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*/
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function block(array) {
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return array && array.length !== 0 ? '{\n' + indent(join(array, '\n')) + '\n}' : '';
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}
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/**
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* If maybeString is not null or empty, then wrap with start and end, otherwise
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* print an empty string.
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*/
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function wrap(start, maybeString, end = '') {
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return maybeString ? start + maybeString + end : '';
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}
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function indent(maybeString) {
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return maybeString && ' ' + maybeString.replace(/\n/g, '\n ');
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}
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function isMultiline(string) {
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return string.indexOf('\n') !== -1;
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}
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function hasMultilineItems(maybeArray) {
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return maybeArray && maybeArray.some(isMultiline);
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} |