Add valueToLiteral() #3812
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Add valueToLiteral() #3812
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This was referenced Jan 1, 2023
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Implements graphql/graphql-spec#794 Adds: * DOT punctuator in lexer * Improvements to lexer errors around misuse of `.` * Minor improvement to parser core which simplified this addition * `SchemaCoordinate` node and `isSchemaCoodinate()` predicate * Support in `print()` and `visit()` * Added function `parseSchemaCoordinate()` since it is a parser entry point. * Added function `resolveSchemaCoordinate()` and `resolveASTSchemaCoordinate()` which implement the semantics (name mirrored from `buildASTSchema`) as well as the return type `ResolvedSchemaElement`
* Defines a `GraphQLSchemaElement` base class which defines a `.coordinate` property and `toString`/`toJSON` methods. * Adds base class to types, fields, arguments, input fields, enum values, and directives. * Uses this in validation error printing string templates.
Removes `valueFromAST()` and adds `coerceInputLiteral()` as an additional export from `coerceInputValue`. The implementation is almost exactly the same as `valueFromAST()` with a slightly more strict type signature and refactored tests to improve coverage (the file unit test has 100% coverage) While this does not change any behavior, it could be breaking if you rely directly on the valueFromAST() method. Use `coerceInputLiteral()` as a direct replacement.
Fixes graphql#3051 This change solves the problem of default values defined via SDL not always resolving correctly through introspection by preserving the original GraphQL literal in the schema definition. This changes argument and input field definitions `defaultValue` field from just the "value" to a new `GraphQLDefaultValueUsage` type which contains either or both "value" and "literal" fields. Since either of these fields may be set, new functions for resolving a value or literal from either have been added - `getLiteralDefaultValue` and `getCoercedDefaultValue` - these replace uses that either assumed a set value or were manually converting a value back to a literal. Here is the flow for how a default value defined in an SDL would be converted into a functional schema and back to an SDL: **Before this change:** ``` (SDL) --parse-> (AST) --coerceInputLiteral--> (defaultValue config) --valueToAST--> (AST) --print --> (SDL) ``` `coerceInputLiteral` performs coercion which is a one-way function, and `valueToAST` is unsafe and set to be deprecated in graphql#3049. **After this change:** ``` (SDL) --parse-> (defaultValue literal config) --print --> (SDL) ```
By way of introducing type `VariableValues`, allows `getVariableValues` to return both the coerced values as well as the original sources, which are then made available in `ExecutionContext`.
* Adds `valueToLiteral()` which takes an external value and translates it to a literal, allowing for custom scalars to define this behavior. This also adds important changes to Input Coercion, especially for custom scalars: * The value provided to `parseLiteral` is now `ConstValueNode` and the second `variables` argument has been removed. For all built-in scalars this has no effect, but any custom scalars which use complex literals no longer need to do variable reconciliation manually (in fact most do not -- this has been an easy subtle bug to miss). This behavior is possible with the addition of `replaceASTVariables`
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#3065 rebased on main.
Depends on #3811
@leebyron comments from original PR: