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Accessor Compiler

From-v4.2Experimental

parseExpressionString(expression: string): (row: Record<string, unknown>) => unknown

Compiles a JSON-style accessor expression into a reusable function.

Supported forms​

  • - returns the input object unchanged.
  • a.b.c resolves nested properties using dot-path access.
  • General expressions like value * 100 are parsed and evaluated against the input object.

Restrictions​

Function calls are rejected when using parseExpressionString().

That restriction mirrors the original use inside @deck.gl/json, where accessor expressions are evaluated against plain data objects rather than executable environments.

Because of that restriction, function libraries such as BASIC_MATH_FUNCTION_LIBRARY and GEOSPATIAL_FUNCTION_LIBRARY are intended for eval(), evalAsync(), compile(), and compileAsync(), not for parseExpressionString().