npm install esvalid
esvalid.isValid(node)
:: Spidermonkey AST Node → BooleanReturns true if and only if the given AST node represents a valid ECMAScript program.
esvalid.isValidExpression(node)
:: Spidermonkey AST Node → BooleanReturns true if and only if the given AST node represents a valid ECMAScript expression.
esvalid.errors(node)
:: Spidermonkey AST Node → [InvalidAstError]Returns an array of InvalidAstError
objects representing the errors in the
given AST. An effort is made to continue collecting errors in the face of
malformed ASTs. If an empty array is returned, it is implied that the given AST
node is error free.
new esvalid.InvalidAstError(node, message)
:: Node -> String -> InvalidAstErrorConstructs a new InvalidAstError
instance. node
must be non-null.
var esvalid = require("esvalid");
var esprima = require("esprima");
var program = esprima.parse(fs.readFileSync(require.resolve("esprima")));
esvalid.isValid(program); // true
esvalid.isValid({type: "Program", body: []}); // true
esvalid.isValid({type: "Program", body: null}); // false
esvalid.isValidExpression({type: "Program", body: []}); // false
esvalid.isValidExpression({type: "Literal", value: 0}); // true
esvalid.errors({type: "Program", body: []}); // []
var error = esvalid.errors({type: "Program", body: null})[0];
error instanceof esvalid.InvalidAstError; // true
error.node; // {type: "Program", body: null}
error.message; // "Program `body` member must be non-null"
This is a list of all esvalid validity tests other than null
tests and type checks.
param
member must not be eval
or arguments
in strict modeid
member must not be eval
or arguments
in strict modeid
member must not be eval
or arguments
in strict modename
member must be a valid IdentifierNamename
member must not be a ReservedWordalternate
must not be the consequent
of an IfStatement with a non-null alternate
property
member must have a valid IdentifierName name
membervalue
member must have zero parametersvalue
member must have exactly one parameterexpressions
member length must be >= 2cases
member must contain no more than one SwitchCase with a null test
memberhandler
member or a non-null finalizer
memberdelete
with unqualified identifier not allowed in strict modedeclarations
member must be non-empty