[Home](./index.md) > [@datashaper/schema](./schema.md) > [TypeHints](./schema.typehints.md) ## TypeHints interface Configuration values for interpreting data types when parsing a delimited file. By default, all values are read as strings - applying these type hints can derive primitive types from the strings. Signature: ```typescript export interface TypeHints ``` ## Properties | Property | Modifiers | Type | Description | | --- | --- | --- | --- | | [arrayDelimiter?](./schema.typehints.arraydelimiter.md) | | string | (Optional) The character to use for delimiting arrays. | | [dataFormat?](./schema.typehints.dataformat.md) | | [DataFormat](./schema.dataformat.md) | (Optional) The data format | | [dateFormat?](./schema.typehints.dateformat.md) | | string | (Optional) Default date format to use when parsing dates. The Codebook can override this at the column level. Default: yyyy-MM-dd TODO: spark has a separate config for datetime. Do we care? | | [decimal?](./schema.typehints.decimal.md) | | string | (Optional) Character to use when parsing decimal numbers. Default: . | | [falseValues?](./schema.typehints.falsevalues.md) | | string\[\] | (Optional) Default: case-insensitive word "false". | | [infinity?](./schema.typehints.infinity.md) | | \[string, string\] | (Optional) Strings to parse as negative and positive infinity. Default: case insensitive \["-inf", "inf"\]. | | [naValues?](./schema.typehints.navalues.md) | | string\[\] | (Optional) Strings to consider NaN or null. Default: \['-1.\#IND', '1.\#QNAN', '1.\#IND', '-1.\#QNAN', '\#N/A N/A', '\#N/A', 'N/A', 'n/a', 'NA', '', '\#NA', 'NULL', 'null', 'NaN', '-NaN', 'nan', '-nan', ''\] | | [thousands?](./schema.typehints.thousands.md) | | string | (Optional) For large numbers that have been written with a thousands separator, you can set the thousands keyword to a string of length 1 so that integers will be parsed correctly. By default, numbers with a thousands separator will be parsed as strings. Default: none. | | [trueValues?](./schema.typehints.truevalues.md) | | string\[\] | (Optional) Default: case-insensitive word "true". |