nl_tokens: Returns an array of strings from axis tickValues for a given axis
pl_tokens: function getStringsFromAxes ( props , axis ) { const { tickValues , tickFormat } = props ; let tickValueArray ; if ( ! tickValues || ( ! Array . isArray ( tickValues ) && ! tickValues [ axis ] ) ) { tickValueArray = tickFormat && <mask> . isArray ( tickFormat ) ? tickFormat : [ ] ; } else { tickValueArray = tickValues [ axis ] || tickValues ; } return tickValueArray . filter ( ( val ) => typeof val === "string" ) ; }