@@ -91,7 +91,7 @@ function flatten(obj, useProperties) {
9191 if ( useProperties ) {
9292 if ( '_cvtProperties' in val ) {
9393 val = val . _cvtProperties
94- key = key + ' ._cvtProperties'
94+ key = ` ${ key } ._cvtProperties`
9595 } else {
9696 entries . push ( [ key , val ] )
9797 continue
@@ -102,7 +102,7 @@ function flatten(obj, useProperties) {
102102 // Don't filter out empty objects
103103 if ( subkeys . length > 0 ) {
104104 subkeys . forEach ( function ( subkey ) {
105- stack . push ( key + '.' + subkey )
105+ stack . push ( ` ${ key } . ${ subkey } ` )
106106 } )
107107 continue
108108 }
@@ -147,8 +147,7 @@ function validate(instance, schema, strictValidation) {
147147 throw new Error ( 'missing' )
148148 }
149149 } catch ( e ) {
150- const err = new Error ( "configuration param '" + name
151- + "' missing from config, did you override its parent?" )
150+ const err = new Error ( `configuration param '${ name } ' missing from config, did you override its parent?` )
152151 errors . missing . push ( err )
153152 return
154153 }
@@ -159,7 +158,7 @@ function validate(instance, schema, strictValidation) {
159158 if ( schemaItem . format === 'object' || typeof schemaItem . default === 'object' ) {
160159 Object . keys ( flatInstance )
161160 . filter ( function ( key ) {
162- return key . lastIndexOf ( name + '.' , 0 ) === 0
161+ return key . lastIndexOf ( ` ${ name } .` , 0 ) === 0
163162 } ) . forEach ( function ( key ) {
164163 delete flatInstance [ key ]
165164 } )
@@ -179,8 +178,7 @@ function validate(instance, schema, strictValidation) {
179178
180179 if ( strictValidation ) {
181180 Object . keys ( flatInstance ) . forEach ( function ( name ) {
182- const err = new Error ( "configuration param '" + name
183- + "' not declared in the schema" )
181+ const err = new Error ( `configuration param '${ name } ' not declared in the schema` )
184182 errors . undeclared . push ( err )
185183 } )
186184 }
@@ -190,8 +188,8 @@ function validate(instance, schema, strictValidation) {
190188
191189// helper for asserting that a value is in the list of valid options
192190function contains ( options , x ) {
193- assert ( options . indexOf ( x ) !== - 1 , 'must be one of the possible values: ' +
194- JSON . stringify ( options ) )
191+ assert ( options . indexOf ( x ) !== - 1 ,
192+ `must be one of the possible values: ${ JSON . stringify ( options ) } ` )
195193}
196194
197195const BUILT_INS_BY_NAME = {
@@ -209,7 +207,7 @@ const BUILT_INS = BUILT_IN_NAMES.map(function(name) {
209207
210208function normalizeSchema ( name , node , props , fullName , env , argv , sensitive ) {
211209 if ( name === '_cvtProperties' ) {
212- throw new Error ( "'" + fullName + " ': '_cvtProperties' is reserved word of convict." )
210+ throw new Error ( `' ${ fullName } ': '_cvtProperties' is reserved word of convict.` )
213211 }
214212
215213 // If the current schema node is not a config property (has no "default"), recursively normalize it.
@@ -219,8 +217,7 @@ function normalizeSchema(name, node, props, fullName, env, argv, sensitive) {
219217 _cvtProperties : { }
220218 }
221219 Object . keys ( node ) . forEach ( function ( k ) {
222- normalizeSchema ( k , node [ k ] , props [ name ] . _cvtProperties , fullName + '.' +
223- k , env , argv , sensitive )
220+ normalizeSchema ( k , node [ k ] , props [ name ] . _cvtProperties , `${ fullName } .${ k } ` , env , argv , sensitive )
224221 } )
225222 return
226223 } else if ( typeof node !== 'object' || Array . isArray ( node ) ||
@@ -242,8 +239,7 @@ function normalizeSchema(name, node, props, fullName, env, argv, sensitive) {
242239 // associate this property with a command-line argument
243240 if ( o . arg ) {
244241 if ( argv [ o . arg ] ) {
245- throw new Error ( "'" + fullName + "' reuses a command-line argument: " +
246- o . arg )
242+ throw new Error ( `'${ fullName } ' reuses a command-line argument: ${ o . arg } ` )
247243 }
248244 argv [ o . arg ] = fullName
249245 }
@@ -263,16 +259,14 @@ function normalizeSchema(name, node, props, fullName, env, argv, sensitive) {
263259 const Format = typeof format === 'string' ? BUILT_INS_BY_NAME [ format ] : format
264260 newFormat = function ( x ) {
265261 assert ( Object . prototype . toString . call ( x ) ==
266- Object . prototype . toString . call ( new Format ( ) ) ,
267- 'must be of type ' + Format . name )
262+ Object . prototype . toString . call ( new Format ( ) ) , `must be of type ${ Format . name } ` )
268263 }
269264 o . format = Format . name . toLowerCase ( )
270265
271266 } else if ( typeof format === 'string' ) {
272267 // store declared type
273268 if ( ! types [ format ] ) {
274- throw new Error ( "'" + fullName + "' uses an unknown format type: " +
275- format )
269+ throw new Error ( `'${ fullName } ' uses an unknown format type: ${ format } ` )
276270 }
277271
278272 // use a predefined type
@@ -286,8 +280,7 @@ function normalizeSchema(name, node, props, fullName, env, argv, sensitive) {
286280 newFormat = format
287281
288282 } else if ( format && typeof format !== 'function' ) {
289- throw new Error ( "'" + fullName +
290- "': `format` must be a function or a known format type." )
283+ throw new Error ( `'${ fullName } ': "format" must be a function or a known format type.` )
291284 }
292285
293286 if ( ! newFormat && ! format ) {
@@ -450,7 +443,7 @@ function walk(obj, path, initializeMissing) {
450443 } else if ( k in obj ) {
451444 obj = obj [ k ]
452445 } else {
453- throw new Error ( " cannot find configuration param '" + path + "'" )
446+ throw new Error ( ` cannot find configuration param '${ path } '` )
454447 }
455448 }
456449 }
@@ -730,10 +723,10 @@ convict.addFormat = function(name, validate, coerce) {
730723 name = name . name
731724 }
732725 if ( typeof validate !== 'function' ) {
733- throw new Error ( ' Validation function for ' + name + ' must be a function.' )
726+ throw new Error ( ` Validation function for '${ name } ' must be a function.` )
734727 }
735728 if ( coerce && typeof coerce !== 'function' ) {
736- throw new Error ( ' Coerce function for ' + name + ' must be a function.' )
729+ throw new Error ( ` Coerce function for '${ name } ' must be a function.` )
737730 }
738731 types [ name ] = validate
739732 if ( coerce ) {
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